Choose the equation below whose axis of symmetry is x = 2.

y = x2 + 4x + 2

y = x2 - 4

y = x2 - 2

y = x2 - 4x + 2

The answer is y = x2 - 4

if you try to factor out all of the equations given to you (ex. 0=x2+4x+2), the only equation that can be factored out is y = x2 - 4.

y = x2 - 4

0 = x2 - 4

0 = (x-2) (x+2)

0=x-2 0=x+2

2=x x=-2