Question

Which of the following is the equation of the axis of symmetry of the quadratic equation y = 2(x – 4)2 + 7?

x = 7

x = –4

x = 4

x = –7

Answer 1

You already have your equation in vertex form. Which variable in there tells you your axis of symmetry?

Answer 2

-4?

Answer 3

Yep, remember y = a(x-h) + k

Answer 4

Wait, it's positive 4 because you have to remember to make x equal 0.