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Eddi Din [679]
3 years ago
5

Which of the following is an x-intercept of the function, f(x) = x^2 - 64 ?

Mathematics
1 answer:
Luden [163]3 years ago
4 0

Answer:

D. -8

Step-by-step explanation:

An x intercept is where the y value is zero.

We set the expression equal to zero and solve for x.

x^2 - 64 = 0

(x + 8)(x - 8) = 0

x + 8 = 0 or x - 8 = 0

x = 8 or x = 8

Answer: D. -8

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Solve the simultaneous equations by substitution<br> 4x+3y=-2<br> 3y=4-x
stiv31 [10]

Answer: x=-2 y=2

Step-by-step explanation:

I decided that isolating the y value of the second equation is the best way to start solving.

I divide 3 from both sides to get y= (4-x)/3. With this, I can substitute into the first equation. 4x+3(4-x)/3)=-2.

The multiplying the 3 by the denominator three cancels each other out to make:

4x+4-x=-2.

We subtract 4 on both sides and then subtract x from 4x.

We end up with 3x=-6. Then, we divide both sides by 3.

x=-2.

Now we substitute this into the second equation to solve.

3y=4-(-2)

This becomes 3y=4+2 which is 3y=6

We divide both sides by 3 to get y=2

We end up with x=-2 and y=2.

I hope you learned something :)

4 0
2 years ago
Read 2 more answers
The product of three, and a number increased by seven, is -36 .. what is the number ?
Zina [86]

Answer:

Step-by-step explanation:

3(x+7)=-36

x+7=-12

x=-19

4 0
2 years ago
If 400ml is used for 8 pancakes how much is used for 6
UNO [17]

300 ml is used for 6 pancakes.

4 0
3 years ago
Read 2 more answers
F(x)=2x+1/x-1 then f^-1(1)​
olasank [31]

Answer:

  • f⁻¹(x) = (x + 1) / (x - 2)
  • f⁻¹(1 ) = - 2

Step-by-step explanation:

<u>Given function:</u>

  • f(x) = (2x + 1) / (x - 1)

<u>Find its inverse, substitute x with y and f(x) with x, solve for y:</u>

  • x = (2y + 1) / (y - 1)
  • x(y - 1) = 2y + 1
  • xy - x = 2y + 1
  • xy - 2y = x + 1
  • y(x - 2) = x + 1
  • y = (x + 1) / (x - 2)

<u>Substitute y with f⁻¹(x):</u>

  • f⁻¹(x) = (x + 1) / (x - 2)

<u>Find  f⁻¹(1 ):</u>

  • f⁻¹(1 ) = ( 1 + 1) / (1 - 2) = 2 / - 1 = - 2
6 0
2 years ago
Can someone help me, please thanks
Ilya [14]
I believe that the answer is 1845




the surface area of the cube is 1350

the surface area of the pyramid is 495

the total surface area is :
1350 + 495 = 1845



good luck
3 0
3 years ago
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