Answer
$F(x)$ is the antiderivative of $f(x)$.
Work Step by Step
We have
$$ \frac{1}{7}((x+13)^7+c)'=\frac{7}{7}(x+13)^6=((x+13)^6$$
that is, $\int(x+13)^{6} d x=\frac{1}{7}(x+13)^{7}+C$.
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