1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
AlekseyPX
3 years ago
7

PLEASE HELP!! what is the equation for the parabolic function that goes through the points (-3, 67) (-1, 1) and has a stretch fa

ctor of 9
Mathematics
2 answers:
barxatty [35]3 years ago
8 0

Answer:

f(x)=9(x+\frac{1}{6})^2-\frac{21}{4}

Step-by-step explanation:

So, we need to find the equation of a parabolic function that goes through the points (-3,67) and (-1,1) and has a stretch factor of 9.

In other words, we want to find a quadratic with a vertical stretch of 9 that goes through the points (-3,67) and (-1,1).

To do so, we first need to write some equations. Let's use the vertex form of the quadratic equation. The vertex form is:

f(x)=a(x-h)^2+k

Where a is the leading coefficient and (h,k) is the vertex.

Since a is the leading coefficient, it's also our stretch factor. Thus, let a equal 9.

Also, we have two points. We can interpret them as functions. In other words, (-3,67) means that f(-3) equals 67 and (-1,1) means that f(-1) equals 1. Write the two equations:

f(x)=a(x-h)^2+k\\f(-3)=67=9((-3)-h)^2+k

And:

f(x)=a(x-h)^2+k\\f(-1)=1=9((-1)-h)^2+k

Now, we essentially have a system of equations. Thus, to find the original equation, we just need to solve for the vertex. To do so, first isolate the k term in the second equation:

1=9(-1-h)^2+k\\k=1-9(-1-h)^2

Now, substitute this value to the first equation:

67=9(-3-h)^2+k\\67=9(-3-h)^2+(1-9(-1-h)^2)

And now, we just have to simplify.

First, from each of the square, factor out a negative 1:

67=9((-1)(h+3))^2+(1-9(((-1)(h+1))^2)

Power of a product property:

67=9((-1)^2(h+3)^2)+(1-9((-1)^2(h+1)^2))

The square of -1 is positive 1. Thus, we can ignore them:

67=9(h+3)^2+(1-9(h+1)^2)

Square them. Use the trinomial pattern:

67=9(h^2+6h+9)+(1-9(h^2+2h+1))

Distribute:

67=(9h^2+54h+81)+(1-9h^2-18h-9)

Combine like terms:

67=(9h^2-9h^2)+(54h-18h)+(81+1-9)

The first set cancels. Simplify the second and third:

67=36h+73

Subtract 73 from both sides. The right cancels:

67-73=36h+73-73\\36h=-6

Divide both sides by 36:

(36h)/36=(-6)/36\\h=-1/6

Therefore, h is -1/6.

Now, plug this back into the equation we isolated to solve for k:

k=1-9(-1-h)^2

First, remove the negative by simplifying:

k=1-9((-1)(h+1))^2\\k=1-9((-1)^2(h+1)^2)\\k=1-9(h+1)^2

Plug in -1/6 for h:

k=1-9(-\frac{1}{6}+1)^2

Add. Make 1 into 6/6:

k=1-9(-\frac{1}{6}+\frac{6}{6})^2\\  k=1-9(\frac{5}{6})^2

Square:

k=1-9(\frac{25}{36})

Multiply. Note that 36 is 9 times 4:

k=1-9(\frac{25}{9\cdot4})\\ k=1-\frac{25}{4}

Convert 1 into 4/4 and subtract:

k=\frac{4}{4}-\frac{25}{4}\\  k=-\frac{21}{4}

So, the vertex is (-1/6, -21/4).

Now, plug everything back into the very original equation with 9 as a:

f(x)=a(x-h)^2+k\\f(x)=9(x+\frac{1}{6})^2-\frac{21}{4}

And this is our answer :)

sergiy2304 [10]3 years ago
3 0
AEUJNDUOMBDWEIOOMXAIKMOOESVNOUEWDCYVUJOLDS
You might be interested in
Berto invested in a precious mineral. The value of the mineral tend to increase by about 11% per year. He invest $40,000 in 2015
stealth61 [152]

the difference from 40000 to the future value in 2020, namely 5 years later is simply the yield or interest amount.


\bf ~~~~~~ \textit{Simple Interest Earned} \\\\ I = Prt\qquad \begin{cases} I=\textit{interest earned}\\ P=\textit{original amount deposited}\dotfill & \$40000\\ r=rate\to 11\%\to \frac{11}{100}\dotfill &0.11\\ t=years\dotfill &5 \end{cases} \\\\\\ I=(40000)(0.11)(5)\implies I=22000

5 0
3 years ago
Please help solve equation
gregori [183]
<h2><u>Solution</u> :-</h2>

Height of Eric = 6 + 1/6 feet

= 37/6 feet

Height of his brother = 5 + 3/4 feet

= 23/4 feet

Difference between their height :

= 37/6 - 23/4

= (74 - 69)/12

= 5/12

<u>Hence</u>,

Eric is 5/12 feet taller than his brother.

3 0
3 years ago
What are the x and y of y=3x-7 y=2x-5​
stiv31 [10]

Answer:

x=2 and y=-1

Step-by-step explanation:

set equations equal

5 0
3 years ago
Solve for the inequality? <br> A OR B?
ASHA 777 [7]

Step-by-step explanation:

3x - x = 2x

2(x + 2) = 2x + 2

for every number of x, 2x + 2 would always be larger than 2x.

so there is no solution, since the given equation is 2x is greater than 2x + 2.

6 0
2 years ago
Simplify x+6/12 over x-8/10 ...?
Kipish [7]
(x + 6) / 12 / (x - 8) / 10 =
(x + 6) 10 / (x - 8) 12 =
(x + 6) 5 / (x - 8) 6

The correct answer is (x + 6) 5 / (x - 8) 6
First you multiply (x+6) by 10 and (x-8) by 12, and then you divide both 10 and 12 by 2. 
8 0
3 years ago
Other questions:
  • What are the steps of determine an inverse of a function?
    13·1 answer
  • Someone lmk what the answer is
    11·1 answer
  • 16 is 4% of what number?
    12·1 answer
  • What is the product 2x(x-4)
    5·2 answers
  • b) The sum of 9 times a larger number and twice a smaller is 6. The difference of 3 times the larger and the smaller is 7. Compu
    12·1 answer
  • How is the answer -1? How do I get it?
    8·2 answers
  • Which shows the correct substitution of the values a, b, and c from the equation 0 = 4x2 2x – 1 into the quadratic formula below
    10·1 answer
  • Please help fast!!!
    13·2 answers
  • Below are two different functions, f(x) and g(x). What can be determined about their y-intercepts? graph going through negative
    5·1 answer
  • What is the surface area of the cylinder with height 4 in and radius 4 in? Round your answer to the nearest thousandth.
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!