Find the equation of the axis of symmetry of the parabola.
-$$f ( x ) = ( x + 9 ) ^ { 2 } - 2$$
A) $y = 2$
B) $x = 2$
C) $x = 9$
D) $x = - 9$

Question

Quizplus · Accepted Answer

The axis of symmetry of a parabola in the form $f(x) = (x - h)^2 + k$ is given by the line $x = h$. For the given parabola $f(x) = (x + 9)^2 - 2$, it is in the form $f(x) = (x - (-9))^2 + k$, so the axis of symmetry is $x = -9$.

Find the Equation of the Axis of Symmetry of the Parabola