Chapter 8 - Review - Page 532: 41

The vertex is labeled with its coordinates, and the green line is the axis of symmetry.

$f(x)=x^2-4$ $a=1$, $b=0$, $c=-4$ The axis of symmetry is at $x=-b/2a$ $x=-b/2a$ $x=-0/2*1$ $x=-0/2$ $x=0$ The vertex is at $x=0$ $f(x)=x^2-4$ $f(0)=0^2-4$ $f(0)=0-4$ $f(0)=-4$ $(0, -4)$ is the vertex.