Question

What is the equation, in standard form, of a parabola that models the values in the table?

x -2 0 4
f(x) -7 3 -73

A. y = -4x2 - 3x + 3
B. y = 4x2 + 3x - 3
C. y = -3x2 - 3x + 4
D. y = -3x2 - 4x + 3

Answer 1

Replace the values of x into the 4 equations to find the one that fits.
Exp A: -4(-2)^2 - 3(-2) + 3 = -16 + 6 + 3 = -7. OK
Check: x = 0 -> y = 3. OK
x = 4 ->y = -64 - 12 + 3 = -73. OK

Answer 2

i understand what you are doing on the first part (exp a)
i dont understand hwta you did when you put check...
sorry i am terrible at math :(

Answer 3

what*

Answer 4

I used the first column data (x = -2; y= -7) to test with equation A. The data fit, so A is the answer.
I verified the data of other columns (x = 0, x = 4) to see if the equation A does also fit.

Answer 5

holy crap i understand haha thank you

Answer 6

how do i close the question and give you a medal?