Answer
$-x^{2}+x-7$
Work Step by Step
We know that $(f-g)(x)=f(x)-g(x)$.
Therefore, $(f-g)(x)=f(x)-g(x)=(x-6)-(x^{2}+1)=-x^{2}+x+(-6-1)=-x^{2}+x-7$.
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