Answer
$(f+g)(x)=3x^{2}+x-5$
$(f+g)(5)=75$
Work Step by Step
$(f+g)(x)=f(x)+g(x)$
$=x-5+3x^{2}$
$=3x^{2}+x-5$
Plugin $x=5$ into $3x^{2}+x-5$.
$(f+g)(5)=3\times5^{2}+5-5=3\times25=75$
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