Question 1030767
Easiest to first find the x-axis intercepts.


{{{-4x^2-24x=0}}}
{{{x^2+6x=0}}}
{{{x(x+6)=0}}}
x intercepts are 0 and -6.


The middle value between them is  -3, which means the symmetry axis is {{{x=-3}}}.


To complete the vertex, what is f(-3)?