Answer
$(g\circ h)(x) = x^2-6x-2$
Work Step by Step
If $f(x) = x \ , \ g(x) = x-7$ and $h(x) = x^2-6x+5$
$(g\circ h)(x) = g(h(x)) = x^2-6x+5-7 = x^2-6x-2$
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