Question

Which of the following is the equation of the axis of symmetry of the quadratic equation y = 2x^2 – 12x + 22?
Answer
a.x = –4
b.x = –3
c.x = 3
d.x = 4

Answer 1

c. I would write it in vertex form.
Factor out a 2
2(x^2-6x) + 22
2(x^2-6x+9) + 22 + 18
2(x-3)^2 + 40

Answer 2

oops I meant -18 in the second to last step
last one is: 2(x-3)^2 + 4

Answer 3

It doesn't change the answer though. The vertex is (3,4) so the line is x = 3