The graph of the equation $y =ax^2 + bx + c$, where $a$, $b$, and $c$ are constants, is a parabola with axis of symmetry $x = -3.$ Find b/a.

Thanks guys!

A parabola with equation y = ax^{2} + bx + c has an axis of symmetry at x = -b/(2a).

That means -b/(2a) = -3 in this case.

b/(2a) = 3

b/a = 6.