Question

What is the equation, in standard form, of a parabola that contains the following points?
(-2,-20),(0,-4),(4,-20)

Answer 1

y = -2x^2 + 4x - 4

Answer 2

How did you get that @-EtherealEbullience ?

Answer 3

y = ax^2 + bx + c,

-20 = 4a - 2b + c
-4 = c
-20 = 16a + 4b + c

Answer 4

For the third equation, how did you get 16a?

Answer 5

4x^2

Answer 6

!!! Thank you ! (: