Question

Which of the following is the equation of the axis of symmetry of the quadratic equation y = 2x^2 + 24x + 62?

a) -10
b) -6
c) 6
d) 10

Answer 1

2(x^2 + 12x + 32)
= 2*(x + 6)^2 - 6^2 + 32

minimum occurs at x = -6, which is also the axis of symmetry.

So axis of symmetry is x = -6

Ans. b) -6.