Answer
$(g\circ h)(x)=x^2-6x-2$
Work Step by Step
Since $(g\circ h)(x) = g(h(x))$, then,
\begin{array}{l}
(g\circ h)(x)=g(x^2-6x+5)\\\\
(g\circ h)(x)=x^2-6x+5-7\\\\
(g\circ h)(x)=x^2-6x-2
.\end{array}
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