## Precalculus (6th Edition) Blitzer

$\left( g\circ f \right)\left( -1 \right)=1$
The value of the given composite function can be obtained using the definition of composite functions and the values of $f$ and $g$ at the required points, which can be obtained very easily from the above table. \begin{align} & \left( g\circ f \right)\left( -1 \right)=g\left[ f\left( -1 \right) \right] \\ & =g\left( 1 \right) \\ & =1 \end{align}