Question

Use the zeros of the following quadratic to find the x-value of the vertex.

y = x2 + 2x – 8
A.
2
B.
1
C.
–1
D.
–8

Answer 1

What are the zeros of that quadratic?

Answer 2

The vertex will have an x-value which is exactly in the middle of the two zeros, because a parabola is symmetrical about the vertex.

Answer 3

set your equation so that it would equal to zero
0 = x^2 + 2x – 8