Answer:
C. x =3
Step-by-step explanation:
Extraneous solution is that root of a transformed equation that doesn't satisfy the equation in it's original form because it was excluded from the domain of the original equation.
Let's solve the equation first
[tex]\sqrt{45-3x} = x-9\\Taking\ square\ on\ both\ sides\\{(\sqrt{45-3x})}^2 = {(x-9)}^2\\45-3x = x^2-18x+81\\0 = x^2-18x+81-45+3x\\x^2-15x+36 = 0\\x^2-12x-3x+36 = 0\\x(x-12)-3(x-12) = 0\\(x-3)(x-12)\\x-3 = 0\\=> x =3\\x-12 = 0\\x = 12\\We\ will\ check\ the\ solutions\ one\ by\ one\\So,\\for\ x=3\\\sqrt{45-3(3)} = 3-9\\\sqrt{45-9} = -6\\\sqrt{36}= -6\\6\neq -6\\For x=12\\\sqrt{45-3(12)} = 12-9\\\sqrt{45-36} = 6\\\sqrt{36}= 6\\6=6[/tex]
Hence, we can conclude that x=3 is an extraneous solution of the equation ..
Answer:
C
Step-by-step explanation:
Beth rented a bike from Julia's Bikes. It cost $19.60 plus $6 per hour. Write an expression for the total cost Beth had to pay
Answer:
c = 6t + 19.60
Step-by-step explanation:
Let t = the time in hours for which Beth rented the bike. Then
6t = the rental cost for the bike and
$19.60 = the up-front cost
The expression for the total cost (c) is
c = 6t + 19.60
The expression for the total cost is C = 19.60 + 6t. According to the given statements, time t is the variable term.
What is an expression?An expression is the combination of variables, coefficients, and constants. These are separated by operators like addition or subtraction. Each combination is called a term.
Calculation:Given that,
Beth rented a bike from Julia's Bikes.
It cost $19.60 plus $6 per hour.
So, here the variable is time because as the time increases the cost also increases.
Consider time = t and the total cost = C
Then, the expression that represents the given statements is
C = 19.60 + 6t
∴ The expression is C = 19.60 + 6t.
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If the x- and y-values in each pair of a set of ordered pairs are interchanged, the resulting set of ordered pairs is known as the _______.
Answer:
Inverse of a function
Step-by-step explanation:
If the x- and y-values in each pair of a set of ordered pairs are interchanged, the resulting set of ordered pairs is known as the inverse of a function.
For example, given the following function:
y = 2x
If x=0 → y= 0
If x=1 → y= 2
If x=2 → y= 4
Now, if we find the inverse of the function:
y = 2x → x = 2y → y = x/2
Now:
If x=0 → y= 0
If x=2 → y= 1
If x=4 → y= 2
Comparing both cases, you will notice that the ordered pairs are effectively interchanged.
The resulting set of ordered pairs formed by interchanging the x- and y-values in each pair is known as the inverse of the original set.
Explanation:If the x- and y-values in each pair of a set of ordered pairs are interchanged, the resulting set of ordered pairs is known as the inverse of the original set. In mathematics, an ordered pair is a pair of objects written in a specific order, typically as (x,y). If you switch the positions of the elements to form (y,x), you create an ordered pair that represents the inverse relationship. This is particularly relevant in the context of functions and relations on a Cartesian coordinate system. The concept of ordered pairs is fundamental to understanding mappings and the domain and range of relations.
For example, if you have an ordered pair representing a function, such as (3,4), its inverse would be (4,3). This reflects a new relationship where the original output is now the input and vice versa. The set of all such inverted pairs from a function forms the inverse function, provided that each y value is associated with only one x value (the function is one-to-one).
A relation where the ordering of elements matters contrasts with a set where the order does not affect the identity of the set. Hence, achieving an inverse relationship by switching the ordered pairs is a useful tool in mathematical problem-solving and analysis.
30 POINTS WILL MARK BRAINLIEST!!
Multiply each equation by a number that produces opposite coefficients for x or y.
The coefficient of x needs to be 2.
The current coefficient is 2/5.
To eliminate the 5 in the denominator, we can multiply the equation by 5.
We get
[tex]2x + 30y = - 50[/tex]
Now, to solve the equations, all we need to do is add them.
Hope this helps!
Mia removes the plug from a trough to drain the water. The volume, in gallons, in the trough after it has been unplugged can be modeled by the expression 10x2 −19x + 6, where x is time in minutes. Choose the appropriate form of the expression that would reveal the time in minutes when the trough is empty. 10(0)2 − 19(0) + 6 10(x − 6)2 − 1 10(x − 1)2 − 6 (5x − 2)(2x − 3)
Answer:
The correct option is D) (5x − 2)(2x − 3).
Step-by-step explanation:
Consider the provided expression.
[tex]10x^2-19x+6[/tex]
Where x is time in minutes.
We need to find the appropriate form of the expression that would reveal the time in minutes when the trough is empty.
When the trough is empty the whole expression becomes equal to 0.
Substitute the whole expression equal to 0 and solve for x that will gives us the required expression.
[tex]10x^2-19x+6=0[/tex]
[tex]10x^2-15x-4x+6=0[/tex]
[tex]5x(2x-3)-2(2x-3)=0[/tex]
[tex](5x-2)(2x-3)=0[/tex]
Now consider the provided option.
By comparison the required expression is D) (5x − 2)(2x − 3).
Hence, the correct option is D) (5x − 2)(2x − 3).
Answer:
The correct answer is D
Step-by-step explanation:
simplify the trigonometric expression tan(2x)/tan(x) using double-angle identities !!
A. 2/1-tan^2(x)
B. 2tan(x)/1-tan^2(x)
C. 2tan(x)/1-tan^3(x)
D. tan(x)
The correct solution is,
⇒ 2 / (1 - tan²x)
What is an expression?Mathematical expression is defined as the collection of the numbers variables and functions by using operations like addition, subtraction, multiplication, and division.
Given that;
The expression is,
⇒ tan (2x) / tan x
Now, We know that;
tan 2x = (2 tanx / 1 - tan²x)
Hence, We can simplify as;
⇒ tan (2x) / tan x
⇒ (2tan (x) /1 - tan²x) / tan x
⇒ 2 / (1 - tan²x)
Thus, The correct solution is,
⇒ 2 / (1 - tan²x)
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The expression tan(2x)/tan(x) simplifies using the double-angle identity for tangent to 2/(1 - tan^2(x)), which corresponds to Option A.
To simplify the trigonometric expression tan(2x)/tan(x) using double-angle identities, we can use the double-angle identity for tangent:
tan(2x) = 2tan(x)/(1 - tan2(x)).
Now, if we divide tan(2x) by tan(x), we get:
tan(2x)/tan(x) = (2tan(x)/(1 - tan2(x)/tan(x).
With tan(x) in the numerator and denominator, it cancels out, leaving:
2/(1 - tan2(x)).
Therefore, the correct answer is Option A: 2/(1 - tan2(x)).
solve for the indicated variable
ax+r=7, for x
Answer:
x = [tex]\frac{7 - r}{a}[/tex]
Step-by-step explanation:
ax+r=7
ax = 7 - r
x = [tex]\frac{7 - r}{a}[/tex]
What is x, if the volume of the cylinder is 768pi rcm3?
let's recall Cavalieri's Principle, solids with equal altitudes and cross-sectional areas at each height have the same volume, so even though this cylinder is slanted with a height = x and a radius = 8, the cross-sectional areas from the bottom to top are the same thickness and thus the same area, so its volume will be the same as a cylinder with the same height and radius that is not slanted.
[tex]\bf \textit{volume of a cylinder}\\\\ V=\pi r^2 h~~ \begin{cases} r=radius\\ h=height\\ \cline{1-1} r=8\\ h=x\\ V=768\pi \end{cases}\implies 768\pi =\pi (8)^2(x)\implies 768\pi =64\pi x \\\\\\ \cfrac{768\pi }{64\pi }=x\implies 12=x[/tex]
the vertex of this parabola is at (-5,-2). when the x-value is -4, the y-value is 2. what is the coefficient of the squared term in the parabolas equation
Answer:
First case The coefficient of the squared term is 4
Second case The coefficient of the squared term is 1/16
Step-by-step explanation:
I will analyze two cases
First case (vertical parabola open upward)
we know that
The equation of a vertical parabola in vertex form is equal to
[tex]y=a(x-h)^{2}+k[/tex]
where
a is the coefficient of the squared term
(h,k) is the vertex
we have
(h,k)=(-5,-2)
substitute
[tex]y=a(x+5)^{2}-2[/tex]
Find the value of a
Remember that
when the x-value is -4, the y-value is 2.
substitute
For x=-4, y=2
[tex]2=a(-4+5)^{2}-2[/tex]
[tex]2=a(1)-2[/tex]
[tex]a=2+2=4[/tex]
the equation is equal to
[tex]y=4(x+5)^{2}-2[/tex]
therefore
The coefficient of the squared term is 4
Second case (horizontal parabola open to the right)
we know that
The equation of a horizontal parabola in vertex form is equal to
[tex]x=a(y-k)^{2}+h[/tex]
where
a is the coefficient of the squared term
(h,k) is the vertex
we have
(h,k)=(-5,-2)
substitute
[tex]x=a(y+2)^{2}-5[/tex]
Find the value of a
Remember that
when the x-value is -4, the y-value is 2.
substitute
For x=-4, y=2
[tex]-4=a(2+2)^{2}-5[/tex]
[tex]-4=a(4)^{2}-5[/tex]
[tex]-4+5=a(16)[/tex]
[tex]a=1/16[/tex]
the equation is equal to
[tex]x=(1/16)(y+2)^{2}-5[/tex]
therefore
The coefficient of the squared term is 1/16
to better understand the problem see the attached figure
1 mile equals approximately 1.6 kilometers. Approximately how many kilometers are in 4 miles? A) 4 kilometers B) 6 kilometers C) 8 kilometers D) 10 kilometers
Answer:
6
Step-by-step explanation:
I took the same test
Write an equation: The sum of -7 and a is equal to 37
Answer:
-7 + a = 37
Step-by-step explanation:
The value of 'a' is 44 and the equation for the statement "The sum of -7 and a is equal to 37" is -7 + a = 37
Let's start by writing the equation for the given statement:
-7 + a = 37
To find the value of 'a', we need to isolate 'a' on one side of the equation. We can do this by performing inverse operations. The inverse of subtracting 7 is adding 7. So, we will add 7 to both sides of the equation:
-7 + a + 7 = 37 + 7
On the left side, the -7 and +7 cancel out, leaving us with:
a = 44
Therefore, the value of 'a' that satisfies the given equation is 44.
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Question 4 of 10
2 Points
Rewrite the following linear equation in slope-intercept form. Write your
answer with no spaces.
v+4= -2(x-1)
Answer here
SUBMIT
Are you sure that one of the variables is v and not y?
v+4= -2(x-1)
Since you posted v, I will use v in place of y.
v + 4 = -2x + 2
v = -2x + 2 - 4
v = -2x - 2
Done!
What are the possible steps involved in solving the equation shown? Select three options.
3.5 + 1.2(6.3 – 7x) = 9.38
Add 3.5 and 1.2.
Distribute 1.2 to 6.3 and –7x .
Combine 6.3 and –7x .
Combine 3.5 and 7.56.
Subtract 11.06 from both sides.
Answer:
Option B, C and D are correct choices.
Step-by-step explanation:
We have been given an equation [tex]3.5+1.2(6.3-7x)=9.38[/tex]. We are asked to choose the steps that are involved in solving the equation.
Let us solve the equation.
Using distributive property [tex]a(b+c)=ab+ac[/tex], we will distribute 1.2 to 6.3 and [tex]-7x[/tex].
[tex]3.5+1.2*6.3-1.2*7x=9.38[/tex]
[tex]3.5+7.56-8.4x=9.38[/tex]
Therefore, option B is the correct choice.
Now, we will combine like terms.
[tex]11.06-8.4x=9.38[/tex]
Therefore, option C is the correct choice.
Now, we will subtract 11.06 from both sides of our equation.
[tex]11.06-11.06-8.4x=9.38-11.06[/tex]
[tex]-8.4x=-1.68[/tex]
Therefore, option D is the correct choice.
Now, to solve for x, we need to divide both sides of our equation by [tex]-8.4[/tex]
[tex]\frac{-8.4x}{-8.4}=\frac{-1.68}{-8.4}[/tex]
[tex]x=0.2[/tex]
Answer:
Distribute 1.2 to 6.3 and –7x;
Combine 3.5 and 7.56.
Subtract 11.06 from both sides.
Step-by-step explanation:
To answer this expression. Let's follow P.E.M.D.A. order, the acronym for PArenthesis, Exponents, Multiplication, Division and Addends. So distributing the factor 1.2 to the parenthesis content:
[tex]3.5+1.2(6.3-7x)=9.38 \\3.5+7.56-8.4x=9.38[/tex]
Then adding the 3.5 to 7.56 to simplify it:
[tex]3.5+7.56-8.4x=9.38\\\11.06-8.4x=9.38[/tex]
The next step in order to isolate is to subtract 11.06 from both sides
[tex]11.06-8.4x-11.06=9.38-11.06[/tex]
Then it goes on
[tex]-8.4x=-1.68\:\:*(-1)\\8.4x=1.68\Rightarrow x=\frac{1.68}{8.4}\Rightarrow x=\frac{1}{5}\\S=\{ {\frac{1}{5}\}[/tex]
On a map, the endpoints of a straight fence are located at A(4,12) and B(8,22). Lisa plans to install a gate in the fence and wants the gate’s hinges to be the same distance from both ends of the fence. At what point on the map will the gate hinges be placed?
Answer:
[tex](6,17)[/tex]
Step-by-step explanation:
we know that
In this problem
The gate hinges must be placed at the mid-point of the fence.
The formula to calculate the midpoint between two points is
[tex]M(\frac{x1+x2}{2},\frac{y1+y2}{2})[/tex]
we have
[tex]A(4,12),B(8,22)[/tex]
substitute the values in the formula
[tex]M(\frac{4+8}{2},\frac{12+22}{2})[/tex]
[tex]M(6,17)[/tex]
Answer: (6,17)
Step-by-step explanation: Plato and Edmentum
3. Juliet rides her bike. During her ride, elevation
increases a total of 4,228 feet, an increase of 75
feet per mile. How many miles does Juliet ride?
Answer:
56.4 miles
Step-by-step explanation:
4228/75 = 56.37333333
Last year at this time we had 840 employees. Since that time our staff has increased by 5%. How many employees will we have in total?
Answer: Answer should be 882.
Step-by-step explanation:
5% =0.05
840*0.05=42
840+42=882
We will have a total of 882 employees.
What is the percentage?The percentage is defined as a ratio expressed as a fraction of 100.
For example, If Misha obtained a score of 67% on her exam, that corresponds to 67 out of 100. It is expressed as 67/100 in fractional form and as 67:100 in ratio form.
Last year at this time we had 840 employees.
Since that time our staff has increased by 5%.
We have to determine the employees will we have in total
The total employees = 840 + 5% of 840
The total employees = 840 + 0.05 × 840
The total employees = 840 + 42
The total employees = 882
Hence, there are 882 employees will we have in total.
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Give three rational numbers between -2 and -1
Answer:
-1.9, -1.8, and -1.7 (answers will vary)
Step-by-step explanation:
Since you have to pick a rational number that is between -2 and -1 there is an infinite options you can choose from. A rational number is a number that can be written as a fraction so you could choose a number like -1.0000000000000000000000001 and 1.999999999999999999999999.
Point A represents a complex number plotted on a complex plane. Click the point that represents its complex conjugate. PICTURE DOWN BELOW. Which red point would it be?
Answer:
The red point (-4 , -6)
Step-by-step explanation:
* Lets revise the complex number
- The complex number z = a + bi, where a is the real part and b is the
imaginary part
- The real part represented by the x-axis and the imaginary part
represented by the y-axis
- The value of i is √(-1)
- The complex conjugate of a complex number is the number with an
equal real part and an imaginary part equal in magnitude but opposite
in sign
- Ex: the conjugate of a + bi is a - bi
* Lets solve the problem
∵ A is an complex number
∵ The x-coordinate of A is -4 and the y-coordinate of it is 6
∵ The x-axis is the real axis and y-axis is the imaginary axis
∴ A = -4 + 6i
∵ The conjugate numbers are equal in real part and the imaginary
part equal in magnitude and different in sign
∴ The conjugate of A = -4 - 6i
- From the graph The red point (-4 , -6) represents the complex
conjugate of point A
What is a plane figure bounded by four straight line
Answer:
A plane figure with 4 sides is called a quadrilateral.
A quadrilateral is a plane figure bounded by four straight lines in mathematics.
Plane figure bounded by four straight lines: In mathematics, a quadrilateral is a plane figure bounded by four straight lines. Examples of quadrilaterals include squares, rectangles, parallelograms, and trapezoids.
Solve for X and Y
3x+2y=12
12x+8y=48
System of equations have infinitely many solution for x and y.
We have to given that,
System of equation are,
3x + 2y = 12
12x + 8y = 48
We can use the elimination method to solve,
System of equation are,
3x + 2y = 12 .. (i)
12x + 8y = 48 .. (ii)
Multiply by 4 in (i) and subtract from (ii);
12x + 8y - 12x - 8y = 48 - 48
0 = 0
Hence, System of equations have infinitely many solution for x and y.
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Express each ratio as a fraction in lowest terms.
1) 55 cents to 66 cents :
2) 21 inches to 3 feet:
3) 2 weeks to 14 days :
Julio cut one dozen roses from his garden. He gave five to his mother and two to his sister. He cut nine more roses and gave four to his grandmother. How many cut roses did he have left?
Will reward brainlist
Answer:
he would have 10 roses left
Step-by-step explanation:
12-5=7-2=5
5+9=14-4=10
Find the area of the shaded region. Use 3.14 for π as necessary.
A. 17.1 cm²
B. 34.2 cm²
C. 18.2 cm²
D. 28.5 cm²
Answer:
34.24 cm²
Step-by-step explanation:
You first need to find the area of the circle.
4 is radius. r*r*3.14=50.24
Now the triangle is 4*4=16.
50.24-16= 34.24
Answer:
B.
Step-by-step explanation:
The area of the shaded region will be the area of the circle minus the area of the triangle inside the circle. Then:
The circle has radius 4 cm (distance from the center to the edge of the circle), so the area of the circle is
[tex]A=\pi r^2 = 3.14(4cm)^2 = 3.14(16cm^2) = 50.24 cm^2.[/tex]
Now, the area of the triangle is
[tex]A_2 = \frac{b*h}{2}[/tex].
The base of the triangle is the diameter of the circle (as you can see in the image) and the height is the radius of the circle. Then the are of the triangle is
[tex]A_2 = \frac{8*4}{2} = \frac{32}{2} = 16cm^2[/tex].
Finally, the shaded area is [tex]A-A_2 = 50.24-16 = 34.24 cm^2[/tex].
Cube A has an edge length....
Answer:
C. 3 times
Step-by-step explanation:
If cube a has an edge length of 2 and cube b has an edge length of 6,the volume of cube b than cube a is 3 times greater.
For this case we have that by definition, the volume of a cube is given by:
[tex]V = l ^ 3[/tex]
Where:
l: It's the side of the cube
Cube A:
[tex]l = 2\\V = 2 ^ 3 = 8 \ units ^ 3[/tex]
Cube B:
[tex]l = 6\\V = 6 ^ 3 = 216 \ units ^ 3[/tex]
We divide:
[tex]\frac {216} {8} = 27[/tex]
Thus, the volume of cube B is 27 times larger than that of cube A.
Answer:
Option A
in a class of 30 students there are 17 girls. two students are picked randomly to represent the class in the SRC. determine the probability that:
a. both students are boys
b. both students are girls
c. one of the students is a boy
Answer:
See below in bold,.
Step-by-step explanation:
There are 30-17 = 13 boys in the class.
a. Prob(First is a boy ) = 13/30 and Prob( second is a boy = 12/29).
As these 2 events are independent:
Prob( 2 boys being picked) = 13/30 * 12/29 = 26/145 or 0.179 to the nearest thousandth.
b. By a similar method to a:
Prob ( 2 girls being picked) = 17/30 * 16/29 = 136/435 = 0.313 to the nearest thousandth.
c. Prob (First student is a boy and second is a girl) = 13/30 * 17/29 = 221/870.
Prob ( first student is a girl and second is a boy) = 17/30 * 13/29 = 221/870
These 2 events are not independent so they are added:
Prob( one of the students is a boy) = 2 (221/870 = 221/435 = 0.508 to the nearest thousandth.
Indicate which two quadrants “theta” could terminate if sin theta = 4/5
Answer:
1st and 2nd quadrants
Step-by-step explanation:
You have sine is positive since it is 4/5.
Sine is the y-coordinate.
On the coordinate plane y is positive in the 1st and 2nd quadrants.
The values of θ that could terminate when sin θ = 4/5 are in the first and second quadrants. In the first quadrant, both the sine and cosine values are positive, while in the second quadrant, only the sine value is positive.
Explanation:To find the quadrants where θ could terminate when sin θ = 4/5, we need to examine the values of sin θ in each quadrant. The sine function is positive in the first and second quadrants so that θ could terminate in either of these quadrants. In the first quadrant, the sine and cosine values are positive, while in the second quadrant, only the sine value is positive.
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Solve the compound inequality 6b < 36 or 2b + 12 > 6.
Answer:
Answer is all real numbers.
<~~~~~~~~~~~~~~~~~~~~~~~~~~~~~>
---------(-3)---------------------(6)-------------
Step-by-step explanation:
6b<36
Divide both sides by 6:
b<6
or
2b+12>6
Subtract 12 on both sides:
2b>-6
Divide both sides by 2:
b>-3
So we want to graph b<6 or b>-3:
o~~~~~~~~~~~~~~~~~~~~~~~~~~ b>-3
~~~~~~~~~~~~~~~~~~~~~~~~o b<6
_______(-3)____________(6)___________
So again "or" is a key word! Or means wherever you see shading for either inequality then that is a solution to the compound inequality. You see shading everywhere so the answer is all real numbers.
<~~~~~~~~~~~~~~~~~~~~~~~~~~~~~>
---------(-3)---------------------(6)-------------
Answer:
All real numbers [tex](-\infty, \infty)[/tex]
Step-by-step explanation:
First we solve the following inequality
[tex]6b < 36[/tex]
Divide by 6 both sides of the inequality
[tex]b<\frac{36}{6}\\\\b<6[/tex]
The set of solutions is:
[tex](-\infty, 6)[/tex]
Now we solve the following inequality
[tex]2b + 12 > 6[/tex]
Subtract 12 on both sides of the inequality
[tex]2b + 12-12 > 6-12[/tex]
[tex]2b> -6[/tex]
Divide by 2 on both sides of the inequality
[tex]\frac{2}{2}b> -\frac{6}{2}[/tex]
[tex]b> -3[/tex]
The set of solutions is:
[tex](-3, \infty)[/tex]
Finally, the set of solutions for composite inequality is:
[tex](-\infty, 6)[/tex] ∪ [tex](-3, \infty)[/tex]
This is: All real numbers [tex](-\infty, \infty)[/tex]
Terrance invested money in a technology stock whose growth is modeled by the function f(x) = 0.01(2)x, where x represents number of days. Find the approximate average rate of change from day 3 to day 8.
A 0.496
B 2.016
C 2.48
D 5
Answer:
Option A 0.496
Step-by-step explanation:
we know that
The approximate average rate of change is equal to
[tex]\frac{f(8)-f(3)}{8-3}[/tex]
[tex]\frac{f(8)-f(3)}{5}[/tex]
we have
[tex]f(x)=0.01(2^{x})[/tex]
Find f(8)
For x=8
[tex]f(8)=0.01(2^{8})=2.56[/tex]
Find f(3)
For x=3
[tex]f(8)=0.01(2^{3})=0.08[/tex]
Find the approximate average rate of change
[tex]\frac{f(8)-f(3)}{5}[/tex]
substitute
[tex]\frac{2.56-0.08}{5}=0.496[/tex]
Answer: A, 0.496
Step-by-step explanation:
To find the difference, you need to raise the base, 2, to each number since x represents the days.
Raise 2 to the power of 3:
2^3 = 8
multiply by 0.01
0.01 * 8 = 0.08
That is the growth of day three.
Now do the same with the 8
Raise 2 to the power of 8
2^8 = 256
Now multiply that by 0.01
0.01 * 256 = 2.56
Now use this formula: f(b) - f(a)/b - a
2.56 - 0.08/8 - 3
Subtract 0.08 from 2.56
2.56 - 0.08 = 2.48
Subtract 3 from 8
8 - 3 = 5
Now divide: 2.48/5 = 0.496
0.496 is the average rate of change between day 3 and day 8. Also I got 100 on the test so I know the answer :))
If a polynomial function f(x) has roots 6 and square root of 5, what must also be a root of f(x)?
A. -6
B. Square root of -5
C. 6 - Square root of 5
D. 6 + Square root of 5
Answer:
-[tex]\sqrt{5}[/tex]
Step-by-step explanation:
A root with square root or under root is only obtained when we take the square root of both sides. Remember that when we take a square root, there are two possible answers:
One answer with positive square rootOne answer with negative square rootFor example, for the equation:
[tex]x^{2}=3[/tex]
If we take the square root of both sides, the answers will be:
[tex]x=\sqrt{3} \text{ or } x= -\sqrt{3}[/tex]
Only getting one solution with square root is not possible. Solutions with square root always occur in pairs.
For given case, the roots are 6 and [tex]\sqrt{5}[/tex]. Therefore, the 3rd root of the polynomial function f(x) had to be -[tex]\sqrt{5}[/tex]
It seems you made error while writing option B, it should be - square root of 5.
Answer:
B
Step-by-step explanation:
What is the distance from (3 1/2, 5) to (3 1/2, –12)?
Answer:
0, 17
3 1/2, 5
-3 1/2, -12
0, 17
Answer:
17
Step-by-step explanation:
First label the 2 points.
A = (3, 1/2, 5), B = (3, 1/2, -12)
Then calculate the vector from A to B:
[tex]\vect{AB} = (0, 0, -17)[/tex]
And then calculate it's length by the formula:
[tex]||\vect{a}|| = \sqrt{x^2 + y^2 + z^2}[/tex], where x, y, z are the coordinates related to the vector.
[tex]||\vect{AB}|| = \sqrt{0^2 + 0^2 + (-17)^2} = \sqrt{(-17)^2} = |17| = 17[/tex]
through:(-2,5), perp. to y = 2x - 5
Answer:
[tex]y-5=\frac{-1}{2}(x+2)[/tex] point-slope form
[tex]y=\frac{-1}{2}x+4[/tex] slope-intercept form
Step-by-step explanation:
The slope-intercept form of a line is y=mx+b where m is the slope and b is the y-intercept.
The slopes of perpendicular lines are opposite reciprocals.
The slope of y=2x-5 is 2.
So we are looking for a line perpendicular to y=2x-5 which means we first to the take the opposite reciprocal of it's slope giving us:
opposite reciprocal of (2) is opposite (1/2)=-1/2.
So the slope of the line we are looking for is -1/2.
This means are equation for our line is in this form:
[tex]y=\frac{-1}{2}x+b[/tex]
To find b we will use a point (x,y) that is on our line.
We are given a point (x,y)=(-2,5).
Plug this into our equation:
[tex]5=\frac{-1}{2}(-2)+b[/tex]
[tex]5=1+b[/tex]
Subtract 1 on both sides:
[tex]4=b[/tex]
So the equation for our line that we are looking for is:
[tex]y=\frac{-1}{2}x+4[/tex] (slope-intercept form).
You could also go for point-slope form [tex]y-y_1=m(x-x_1)[/tex] where m is the slope and [tex](x_1,y_1)[/tex] is a point on the line.
We have m=-1/2 and (x1,y1)=(-2,5) so our equation in point slope-form is:
[tex]y-5=\frac{-1}{2}(x-(-2))[/tex]
Simplifying just a hair:
[tex]y-5=\frac{-1}{2}(x+2)[/tex].