## Precalculus (6th Edition) Blitzer

The graph of the functions $f\left( x \right)=\frac{{{x}^{2}}-1}{x}$ , $f\left( x \right)=\frac{2{{x}^{2}}}{{{x}^{2}}+4}$ , $f\left( x \right)=\frac{1}{x-1}$ , $f\left( x \right)=\frac{1}{{{\left( x+2 \right)}^{2}}}$ , and $f\left( x \right)=\frac{x+2}{{{x}^{2}}+x-6}$ are shown below.