Question 43683
{{{y = -3x^2 - 6x + 4}}}
Since this is a vertical parabola, you would use the {{{x}}} value of the vertex.
V((-b/2a),f(x)) = V((-1),f(x))
Axis of Symmetry: {{{x = -1}}}
{{{ graph( 600, 600, -10, 10, -10, 10, -3x^2 - 6x + 4 ) }}}