graphing
then,
vertex: (0,5)
the coordinate is a maximum
equation of axis of symmetry:
[tex]\begin{gathered} x=-\frac{b}{2a} \\ \text{where b = 0 and a = -1},\text{ so} \\ x=-\frac{0}{2(-1)}=0 \end{gathered}[/tex]
therefore,
axis of symmetry is at: x = 0
