Answer
$x^{2}+x-5$
Work Step by Step
We know that $(f+g)(x)=f(x)+g(x)$.
Therefore, $(f+g)(x)=f(x)+g(x)=(x-6)+(x^{2}+1)=x^{2}+x+(-6+1)=x^{2}+x-5$.
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