Answer
$-\frac{63}{4}$
Work Step by Step
$\int^{3}_{0}(x-x^{3})dx=\int^{3}_{0}xdx-\int^{3}_{0}x^{3}dx $
$=\frac{x^{2}}{2}|^{3}_{0}-\frac{x^{4}}{4}|^{3}_{0}=\frac{3^{2}}{2}-\frac{3^{4}}{4}$
$=\frac{9}{2}-\frac{81}{4}=-\frac{63}{4}$
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