Question

The vertex form of the equation of a parabola is y = 2(x + 4)2 - 21.

What is the standard form of the equation?

Answer 1

y = 2x^2 + 16x + 11

the other answer explains it much better

Answer 2

y = 2x^2 + 16x + 11

Explanation:

2(x + 4)^2 - 21

2(x + 4)(x + 4) - 21

2(x^2 + 8x + 16) - 21

2x^2 + 16x + 32 - 21

2x^2 + 16x + 11