Question

Someone help! The question is in the comments!

Answer 1

I know that theres the answer but I want to know how to do it

Answer 2

your answer is correct

Answer 3

that answer is from the answer book
i want to know how they got that

Answer 4

ok... this is what I did

the vertex form of the parabola is

\[y = a(x - h)^2 + k \]

the vertex is (0, -2) so h = 0, k = -2

substitute them

then to find a, use a point on the curve like

(3, 0) or (-3, 0)

hope it helps