Answer
$$ \frac{1}{4}x^4+x^3+c$$
Work Step by Step
\begin{align*}
\int \frac{x^5+ 3x^4}{x^2}dx&= \int (x^3+ 3x^2)dx\\
&= \frac{1}{4}x^4+x^3+c
\end{align*}
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