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Differentiate 15x2
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If $y = a\mathrm{f}(x)$ then $\frac{dy}{dx}=a\frac{d}{dx}\mathrm{f}(x)$.
In this case
\begin{align} \frac{d}{dx}\left(\var{a}x^\var{n} \right)&= \var{a}\times\simplify{{n}x^{n-1}}\\ &= \simplify{{a}*{n}x^{n-1}}\\ \end{align}
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