Use completing the square to solve for x in the equation (x-12)(x+4)=9.
a. x = –1 or 15
b. x = 1 or 7
c. x=4+√41
d. x=4+√73

Answers

Answer 1
For a quadratic of the form [tex]x^2+bx=-c[/tex], we can solve by completing the square.

First, we must expand the expression and convert it to the form above.

[tex](x-12)(x+4)=9\\x^2+4x-12x-48=9\\x^2-8x=57[/tex]

Completing the square is like forcing a quadratic to be factored like a perfect square trinomial. To do so, we add the square of half of the coefficient b, [tex]( \frac{b}{2})^2[/tex], to both sides of the equation.

[tex]x^2-8x+( \frac{-8}{2})^2=57+( \frac{-8}{2})^2\\\\x^2-8x+16=57+16[/tex]

We then factor like a perfect square trinomial and simplify.

[tex](x-4)^2=73[/tex]

[tex]x-4= \pm \sqrt{73} \\\\ x = 4+\sqrt{73} \ or \ x = 4-\sqrt{73}[/tex]
Answer 2

Answer:

The correct answer is

D


Related Questions

Which of the following values are needed to determine the area of the trapezoid choose all that apply

Answers

To find out area of trapezoid, you will need top and bottom bases and height

answer
8 mm
10 mm
5 mm

What is unique about Pythagorean triples? A The squares of the three sides add up to 100. B The length of each side is a perfect square. C The length of each side is a whole number. D The squares of the three sides are multiples of 3.

Answers

That would be C
Each side is a whole number
Examples are 5 , 4 and 3 .  Also 13,12 and 5

Final answer:

Pythagorean triples are sets of three whole numbers that form the sides of a right triangle and satisfy the Pythagorean theorem, a² + b² = c².

Explanation:

Pythagorean triples are unique because they consist of three whole numbers that satisfy the Pythagorean theorem.

Specifically, the squares of the two shorter sides (a and b), when added together, equal the square of the longest side (the hypotenuse, c). That is, a² + b² = c² holds true for these numbers.

Answering the student's question, the characteristic that is unique about Pythagorean triples is: C) The length of each side is a whole number.

This means that all three sides of the right triangle are integers, which is helpful in various mathematical and practical applications. Examples of Pythagorean triples include (3, 4, 5) and (5, 12, 13).

original price 75$ markdown 15%

Answers

the answer is 63.75 
hope it helps
please mark as brainliest

[tex] \frac{x}{75} [/tex]=[tex] \frac{15}{100} [/tex]

[tex]100x=75×15 [/tex]
[tex]100x=1125 [/tex]
[tex]1125×100=11.25=11 \frac{1}{4} [/tex]

A toy rocket was shot into the air. The graph below represents the height over the time of the rocket. Which of the following are true? Select all that apply.

A. The rocket was launched from a platform 4.9 feet above the ground

B. The rocket reached a maximum height of 59 feet

C. It took the rocket 3.5 seconds to reach its maximum height

D. The rocket landed after 34 seconds

E. The equation that represents the rocket’s height over time has two solutions

Answers

The correct statements are:

- B. The rocket reached a maximum height of 59 feet.

- C. It took the rocket 3.5 seconds to reach its maximum height.

- E. The equation that represents the rocket’s height over time has two solutions.

To determine which statements about the rocket's flight are true, analyze the given graph.

1. Statement B: The rocket reached a maximum height of 59 feet.

  - This statement is true. The highest point on the graph is marked as (3.5, 59), indicating that the maximum height of the rocket was 59 feet.

2. Statement C: It took the rocket 3.5 seconds to reach its maximum height.

  - This statement is true. The coordinates (3.5, 59) show that the rocket reached its maximum height at 3.5 seconds.

3. Statement E: The equation that represents the rocket’s height over time has two solutions.

  - This statement is true. The parabolic path of the rocket implies a quadratic equation. A quadratic equation typically has two solutions, which correspond to the times when the rocket is at ground level (height = 0). From the graph, we see the rocket starts at (0, 0) and lands at (6.9, 0), confirming two solutions.

Verifying the incorrect statements:

1. Statement A: The rocket was launched from a platform 4.9 feet above the ground.

  - This statement is false. The graph shows that the rocket was launched from the origin point (0, 0), meaning it was launched from ground level, not 4.9 feet above the ground.

2. Statement D: The rocket landed after 34 seconds.

  - This statement is false. The graph indicates the rocket landed at 6.9 seconds, not 34 seconds.

The correct options are:

A. The rocket was launched from a platform 4.9 feet above the ground.

B. The rocket reached a maximum height of 59 feet.

C. It took the rocket 3.5 seconds to reach its maximum height.

D. The rocket landed after 34 seconds.

E. The equation that represents the rocket's height over time has two solutions.

To determine the validity of each statement, we must analyze the graph of the rocket's height over time. Here is the logical reasoning behind each option:

A. The rocket was launched from a platform 4.9 feet above the ground.

This statement is true if the graph's vertical intercept (the height at time zero) is 4.9 feet. The vertical intercept is the starting height of the rocket before it is launched.

B. The rocket reached a maximum height of 59 feet.

This statement is true if the graph reaches a maximum value of 59 feet at some point in time. This would be the peak of the graph, where the height is greatest.

C. It took the rocket 3.5 seconds to reach its maximum height.

This statement is true if the time at which the graph reaches its maximum height is 3.5 seconds. This is the horizontal coordinate of the peak of the graph.

D. The rocket landed after 34 seconds.

This statement is true if the graph returns to the horizontal axis (height of zero) at 34 seconds. This would indicate that the rocket has returned to the ground.

E. The equation that represents the rocket's height over time has two solutions.

This statement is true if the graph intersects the horizontal axis at two distinct points. The first intersection represents the launch point (time zero), and the second intersection represents the landing point. The fact that there are two intersections implies that the equation has two solutions.

Simplify expression: (5^3)^3

Answers

Follow PEMDAS

5^3 = 5 x 5 x 5
5 x 5 x 5 = 125

125^3 = 125 x 125 x 125
125 x 125 x 125 =  1,953,125

1,953,125 is your answer

hope this helps
(5^3)^3 = 5^9

answer
5^3 is your simplify answer.

helppppppppppppp meeeeeeeeeeeeeeeee

Answers

9x = -90
X = -10

-10y = -90
Y= 9
9x-10y = -90
 For this case what you should do is see the intersections with each of the axes and then join the ordered pairs.
 We have then:
 For the x axis:
 
y = 0
 Substituting in the equation:
 9x-10 (0) = - 90
 9x-0 = -90
 x = -10
 For the y axis:
 
x = 0
 Substituting in the equation:
 9 (0) -10y = -90
 0-10y = -90
 y = 90/10
 y = 9
 We graph the ordered pairs:
 (x1, y1) = (- 10, 0)
 (x2, y2) = (0, 9)
 Answer:
 See attached graph.

if there are 7 hot dogs in a pound, how many pounds would you buy for a picnic to supply 28 people with two each

Answers

28 divided by 2 = 56 
divide 56 by 7 and you get 8
you need to buy 8 pounds to feed everyone. 
If you divide 28 by 7, you know how many pounds to give everyone one hotdog. To give everyone 2, you multiply your answer by 2 which makes your answer 8.

What is greater 2.159 or 2.259

Answers

2.259, is the answer

2.259 Is greater because 2.1 is smaller then 2.2. Hope this helped :)

Solve -12>3x then graph on a number line that you create and please please show all of your work step by step.

Answers

The work has one step: divide the expression by 3.
.. -4 > x

Because the symbol is "greater than", the circle at x=-4 is an open circle.

Find the area of the regular polygon.

Please explain how you got your answer!

Answers

Each of the triangles are equal in base length, height, and area. Remember the formula for the area of a triangle. The area of any triangle is 1/2 times the length of the base (which, in the polygon, is the length of a side) multiplied by the height (which is the same as the apothem in regular polygon).

Nicole uses 3 cups of vinegar and her salad dressing recipe how much vinegar with Nicole used to make 3/4 of recipe

Answers

Final answer:

Nicole will need 2 1/4 cups of vinegar to make 3/4 of her salad dressing recipe, as you multiply the total amount (3 cups) by 3/4.

Explanation:

Nicole uses 3 cups of vinegar for her full salad dressing recipe. To make 3/4 of the recipe, you would calculate three-quarters of the total amount of vinegar used. Simply multiply 3 cups by 3/4 to find out how much vinegar Nicole would need.

The calculation is as follows:

3 cups × 3/4 = 9/4 cups9/4 cups can be simplified to 2 1/4 cups

Thus, Nicole will need 2 1/4 cups of vinegar to make three-quarters of her salad dressing recipe.

I have 10 minutes, Help! Joani has some stuffed animals. She has 2 times as many as Lily. Lily has 6 stuffed animals. Joanie gave 2 away and bought 4 more. How many stuffed animals does Joani have now?

Students's solution: Lily has 6 stuffed animals, so Joani had 6 × 2 to begin with. So Joani had 12 stuffed animals. She gave away 2, so 12 – 2 = 10. She bought 4, so 10 + 4 = 14. So Joani has 14 stuffed animals.

Here is another problem that can also be solved by working backwards.

Wyatt has 3 times as many baseballs as golf balls. He has 5 fewer tennis balls than baseballs. Wyatt has 4 golf balls.



How many tennis balls does Wyatt have?

Answers

The answer is:  (6x2) - 2= 10 +4=14

"Wyatt has 3 times as many baseballs as golf balls. He has 5 fewer tennis balls than baseballs. Wyatt has 4 golf balls."
3 times as many baseballs as golf balls; 4x3=12; 12 baseballs
5 fewer tennis balls than baseballs; 12-5=7; 7 tennis balls

7 tennis balls

Could someone explain me question 9 thank you

Answers

r1 / r2 = sqrt(m2)  / sqrt(m1)  Notice the numbering system. If the 2 is on the denominator for the r, then it will be in the numerator for the m. You must substitute carefully.

r1 / r2 = sqrt(30) / sqrt(12) 
r1 / r2 = sqrt(2)*sqrt(3)(sqrt(5) / sqrt(3) sqrt(4) but sqrt(4) = 2.

ri / r2 = sqrt(2)* sqrt(3)*sqrt(5) / sqrt(3) * 2 Now you can cancel out sqrt(3)
r1 / r2 = sqrt(2)*sqrt(5) / 2

r1 / r2 = sqrt(10)/2 <<<< answer
B <<< answer. Notice that they put sqrt(2) and sqrt(5) together again.


A retail store marks up its OTC (over-the-counter) merchandise 50% based on acquisition cost. What's the retail price of an item that costs $2?

Answers

$3 because 2 time 1.5 is. Or even if you want to do 2 x 0.5= 1 + 2 = 3.

A cylinder shaped juice pitcher has a diameter of 12 cm and a height of 25 cm. What volume of juice does the pitcher contain when it is 25% full? Use 3.14 to approximate pi. Enter your answer as a decimal to the tenths place in the box

Answers

706.5 is the correct answer I believe. That is of course if the formula for a cylinder us C= 3.14(r×r)×h

Answer:

706.5

Step-by-step explanation:

Zoe's Fish tank holds 27 L of water she uses a 3L container to fill the tank how many times does she have to fill the three litter container in order to fill the fish tank

Answers

Answer:

Zoe's Fish tank holds 27 L of water, so this is the capacity of the tank. On the other hand, Zoe uses a 3L container in order to fill the tank, so the question is  how many times does she have to fill the three litter container in order to fill the fish tank? Let's solve this as follows:

First time:

She pours 3L

Second time:

She pours another 3L, but she previously poured 3L, so she has poured 6L

Third time:

She pours another 3L, but she previously poured 6L, so she has poured 9L

Fourth time:

She pours another 3L, but she previously poured 9L, so she has poured 12L

Fifth time:

She pours another 3L, but she previously poured 12L, so she has poured 15L

Sixth time:

She pours another 3L, but she previously poured 15L, so she has poured 18L

Seventh time:

She pours another 3L, but she previously poured 18L, so she has poured 21L

Eighth time:

She pours another 3L, but she previously poured 21L, so she has poured 24L

Ninth time:

She pours another 3L, but she previously poured 24L, so she has poured 27L

According to this, she needs to pours the 3L container nine times in order to fill the fish tank. This can also be solved dividing 27L/3L= 9

Solve the equation and show all work please show steps!!
4f + 11 = 29

Answers

4f+11=29
4f=29-11
4f=18
f=9/2
Hello,

The answer is "x=4.5 or 5".

Reason:

Write the equation:

4f+11=29

Subtract 11 on both sides:

29-11=18

4f=18

Now divide 18 by 4:

18/4=4.5 (rounded to the whole number) 

f=5

If you need anymore help feel free to ask me!

Hope this helps!

~Nonportrit

PLEASE HELP ME I BEG YOU PLEASE

If y varies inversely as x, find the constant of variation if y = 36 when x = 9.
27
14
324
4

Write an appropriate direct variation equation if y = 30 when x = -10.
y = -300x
y = 300x
y = -3x
y = 3x

Write an appropriate direct variation equation if y = 14 when x = -14.
y = 14x
y = -14x
y = x
y = -x

If y varies inversely as x, and y = 4 as x = 8, find y for the x-value of 2.
16
10
8
14

Answers

1. k = 36/9 = 4

2. 30/-10 = -3, y = -3x

3. 14/-14 = -1, y=-x

4. y=k/x 4 =k/8 k = 32. 32/2 = 16

5. inverse

6. direct
1) 4
2) -3x
3) -x
4) 8
5) inverse variation
6) direct variation

5.7x=5.64
what is x?

Answers

x is 0.989
you divide 5.7 on both sides ( 5.64/5.7) is 0.989
divide both sides by 5.7 
5.7 cancels out with 5.7
5.64/5.7= 0.989 =0.99

check your answer 0.99 x 5.7= 5.643=5.64

a $58 camera is on sale for 20% off find the sale price

Answers

58 x 0.2= 11.6

The sale price is $11.6

The sales price of the camera is $46.4

How to determine the sales price?

The given parameters are:

Discount = 20%

Price = $58

The sales price is calculated using:

Sales price = Price * (1 - discount)

This gives

Sales price = $58* (1 - 20%)

Evaluate

Sales price = $46.4

Hence, the sales price of the camera is $46.4

Read more about discount at:

https://brainly.com/question/843074

#SPJ1

Use the parabola tool to graph the quadratic function. f(x)=2x2+12x+16

Answers

we have that
f(x)=2x²+12x+16

using a graph tool
see the attached figure

Answer:

Step-by-step explanation:

To obtain the graph of a parabola, three data are necessary: ​​the vertex (the vertex is the highest or lowest point of the graph corresponding to the parabola and there it is on the plane of symmetry of the parabola), the roots ( those values ​​of x for which the expression is 0. Graphically,  the roots correspond to the abscissa of the points where the parabola  cuts the x-axis.) and the concavity.

Being f(x)=ax²+bx+c, you can see that, in this case, a=2, b=12 and c=16. So:

Vertex= for your calculation, [tex]xv=\frac{-b}{2*a}=\frac{-12}{2*2}[/tex], so xv=-3. Now that you know x, all you have to do is enter its numerical value into the original formula to find yv. yv=2*(-3)²+12*(-3)+16. Then yv=-2Roots:  The roots are calculated using the expression: [tex]x1,x2=\frac{-b+-\sqrt{b^{2}-4*a*c } }{2*a}[/tex]. Replacing the values that you have:[tex]x1,x2=\frac{-12+-\sqrt{12^{2}-4*2*16 } }{2*2}[/tex] Solving, you obtain x1=-2 and x2=-4Concavity: If a> 0 (positive) the parabola is concave or pointed upwards, while if a <0 (negative) the parabola is convex or pointed downwards. In this case a = 2, so the parabola opens upward, being concave.

In this way, the graph shown in the attached image is obtained.

Use tens to solve 13-7

Answers

You can change it to 130-70 and that'll give you 50.

Then just cross out the 0 from the 50 since 13-7 didn't have any zeros. So 5. 

what happens in the last part if it is 2/8 + 1

Answers

2/8 + 1 = 1 ¼ or 5/4 
Hope it helps. :)
The 2/8 simplifies to 1/4. When added to 1, the result is the mixed number 1 1/4.

You are collecting email addresses from 74 customers per day, which is about 90% of the daily goal of __________ emails per day."

Answers

1. The first step is to realize you need to find a number that will be bigger than 74. 
2. All you have to do for this problem is to divide 74 by 90%. You can put this in the calculator by typing in (74 / .9).
3. The answer you get should be 82.22
4. You can check this by multiplying 82.22 by 90%, and it should bring you back to 74. 

Let f(x)=25x2−2 . The function g(x) is a vertical stretch of f(x) by a factor of 2. What is the equation of g(x)?

Answers

Final answer:

When the function f(x)=25[tex]x^2[/tex]−2 is vertically stretched by a factor of 2 to create the function g(x), the resulting equation is g(x) = 50[tex]x^2[/tex]−4.

Explanation:

The equation of g(x) can be found by vertically stretching f(x) by a factor of 2. Since f(x) = 25[tex]x^2[/tex] - 2, we can multiply the function by 2 to get g(x) the equation:

The function g(x) is described as a vertical stretch of the function f(x) by a factor of 2. If f(x)=25[tex]x^2[/tex]−2, a vertical stretch implies that we multiply all y-coordinates by the given factor, which is 2 in this case. Therefore, g(x) will be 2*f(x).

This gives us:

g(x) = 2*(25[tex]x^2[/tex] −2)

Expand this:

g(x) = 50[tex]x^2[/tex]−4

So, the equation of g(x) after the vertical stretch of f(x) by a factor of 2 is g(x) = 50[tex]x^2[/tex] −4.

Learn more about Vertical stretch of a function here:

https://brainly.com/question/30105263

#SPJ12

The equation of g(x), which is a vertical stretch of f(x) = 25x² - 2 by a factor of 2, is g(x) = 50x² - 4.

To solve this, we need to apply a vertical stretch to the function f(x).

A vertical stretch by a factor of 2 means multiplying the entire function f(x) by 2.

Given :

f(x) = 25x² - 2

we multiply it by 2:

g(x) = 2 * (25x² - 2)

g(x) = 50x² - 4

So, the equation of g(x) is g(x) = 50x² - 4.

Draw 4 circle shade 2 circle

Answers

Out of 4 circles, 2 of them are shaded in
2 out of 4 are shaded
How many are shaded? 
2/4 or 1/2

So half of the drawn circles are shaded.

Hope this helps!

What is the volume of a cube with a side length of 5 cm?

A)
10 cm3


B)
15 cm3


C)
25 cm3
Eliminate

D)
125 cm3

Answers

We know that the volume of a cube is determined by 

side x side x side, where each side has the same length.

Since 1 side length is 5cm, we know the other side lengths are also 5cm.

5 cm x 5 cm x 5 cm = D) 125 cm^3
D) I hope this helped and I hope you can pass the test:)

find cos^-1 0.9455 to the nearest degree.
A.26 degrees
B.71 degrees
C.19 degrees
D.41 degrees

Answers

c) 19 degrees

Hope this helped!

Answer:

[tex]Cos^{-1}(0.9455)[/tex] = 19 degree.

Step-by-step explanation:

Given: [tex]Cos^{-1}(0.9455)[/tex].

To find : values of  [tex]Cos^{-1}(0.9455)[/tex].

Solution : We have given that  [tex]Cos^{-1}(0.9455)[/tex].

[tex]Cos^{-1}(0.9455)[/tex].  =0.33166 radians

In form of degree

0.33166 radians =  19 degree.

Therefore,   [tex]Cos^{-1}(0.9455)[/tex] = 19 degree.

Annabel went to the beach for the day and rented a surfboard. The surfboard rental was $7.00 per hour, plus a rental fee of $12.00 which equation could Annabel use to find the total cost (c) if renting a surfboard for x amount of hours?

Answers

She could use: 12+7x=c

The line plot shows what fraction of a mile 13 students ran during their fitness test. What is the sum of the shortest distance a student ran and the longest distance a student ran?

Answers

30/8 Make it into a improper fraction and you got your answer
:D
Hope this helps

The sum of the shortest distance a student ran and the longest distance a student ran is 11/8

What is a fraction?

A fraction represents equal parts of a whole, by dividing it up into equal partitions. Each fraction has a numerator and denominator. The denominator represents the total number of parts the whole has been divided into.

Given is a line plot, describing the distances that is a fraction of a mile, 13 students ran during their fitness test, we need to find the sum of the shortest distance a student ran and the longest distance a student ran,

Here, according to the graph, the shortest distance = 3/8 of a mile

And the longest distance = 8/8 of a mile

So, the sum = 8/8 + 3/8 = 11/8

Hence, the sum of the shortest distance a student ran and the longest distance a student ran is 11/8

Learn more about fractions, click;

https://brainly.com/question/10354322

#SPJ3

Other Questions
Dione has 3 rolls of pennies containing 50 coins each, 4 rolls of nickels containing 40 coins each, 5 rolls of dimes containing 50 coins each, and 6 rolls of quarters containing 40 coins each. How much money does she have? A.$106.20 B.$17.50 C.$8.00 D.$94.50 In the early 1900s, African Americans were not the only ones facing discrimination in the south. A case brought against a Jewish man named Leo Frank in Georgia revealed major antisemitism in 1913. Which of these statements describes a direct result of this case?A)Children under the age of 16 were no longer allowed to work in factories.B)Many southern Christians converted to Judaism, in an effort to support Leo Frank.EliminateC)Federal and state laws surrounding hate crimes against Jewish people were passed.D)About half of Georgia's Jewish population moved to other states following the case. Which sentence uses the correct form of the verb take? A. Did she took a jacket with her when she left? B. Did she have taken a jacket with her when she left? C. Did she take a jacket with her when she left? D. Did she taken a jacket with her when she left? Help pleaseeeee on 7 Why did former uk prime minister david cameron quit? select one:a. he didn't quit, he died in office.b. he was impeached in response to handling finances of the uk poorly.c. he couldn't reach an agreement with the opposition party on issues of energy and the environment.d. he quit when a referendum resulted in the uk voting to leave the european union? Secretary of Defense Robert McNamara and other top advisors believed that the U.S. needed to increase its military presence in Vietnam in order to defeat the communists. Which of the following was passed by Congress and authorized the use of military force in Vietnam? Jose cruz earns $2,275 each month and works 37.5 hours each week. his employer pays him overtime (for hours beyond 37.5) and uses the overtime premium approach. cruz's overtime premium hourly rate is Easy Algebra 2 Rational Expressions question A series of events occurring in the mitochondria leads to the synthesis of which energy molecule The following question is based on your reading of 1984 by George Orwell. What happens in the room above the antique shop at the end of Part 2? What do we find out? Which statement best describes the effect of the Fall of Berlin? The pcr (polymerase chain reaction) protocol that is currently used in laboratories was facilitated by the discovery of a bacterium called thermus aquaticus in a hot spring inside yellowstone national park, wyoming. this organism contains a heat-stable form of dna polymerase known as taq polymerase, which continues to function even after it has been heated to 95 degreesc. why would such a heat-stable polymerase be beneficial in pcr? QUESTION 1 Jan pays $70 each month for her auto insurance policy. This regular payment is called a: Are socail norms and customs the same all over the world Match each term with its definition.A.Carrying capacity Sudden extreme decrease in populationB.Exponential growth The maximum population of a species that the resources of its habitat can supportC.Logistic growth S-curve (population increase that is slow, then accelerating, then slowing and finally leveling off)D.Population crash Population increase where the rate of growth stays the same but numbers increase at an accelerating rate What was targeted in the air campaign launched against North Vietnam?A) civilian villagesB) schoolsC) marketsD) transportation networks HELP!! 10 POINTS!! 1 EASY PROBLEM!! American parents encourage their children to be hard working, efficient, practical, and individualistic. what are these values, along with other norms, beliefs, and mores parents pass to their children that everyone would follow if we lived in a "perfect world" called? question 23 options: As the Civil War began, the Souths strategy was touse its superior resources to overcome the North.defend itself until Northern forces gave up the fight.elect a proslavery president to the White House.block supply ships from entering Southern ports. A client is discharged to his daughter's home. he weighs 250 lb (113.4 kg) and is immobile. the nurse should instruct the daughter on the use of a: