Question 1089062
The axis of symmetry goes through the vertex, so it is {{{x=-1}}} .
If one zero of {{{f(x)}}} is at {{{x=3}}} ,
{{{3-(-1)=4}}} units to the right,
the other zero must be 4 units to the left of the axis,
at {{{x=-1-4=-5}}} , so it is {{{highlight(x=-5)}}} .