# What is the axis of symmetry of the function y=x^2-1?

$y = a {x}^{2} + b x + c$ where $a = 1 , b = 0 \mathmr{and} c = - 1$
The Axis of Symmetry is given by the formula $x = - \frac{b}{2 a}$
$x = - \frac{0}{2 \cdot 1}$
color (green)( x = 0 is the Axis of Symmetry of the Parabola with the equation $y = {x}^{2} - 1$