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 = 2x² + 16x + 11

Explanation:

first foil (x + 4)² to get x² + 8x + 16

distribute 2 to get 2x² + 16x + 32

subtract 21 from 32