Question #75958

2 Answers
May 22, 2017

x = -1

Explanation:

use completing a square to find axis of symetry.

y = 4 x^2 + 8 x - 2

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

y = 4(x + 1)^2 -4(1^2) - 2

y = 4(x + 1)^2 - 6

axis of symetry is when (x + 1) = 0
therefore axis symetry is x = -1

May 22, 2017

x = -1

Explanation:

y = 4x^2 + 8x - 2
x-coordinate of the axis of symmetry:
x = -b/(2a) = -8/8 = - 1