$14^4\cdot14^{-2}$
$4n^2+28n+49$
$\frac{dy}{dx}=\:\frac{36x}{y}$
$\frac{1}{50}x^2-9=0$
$\frac{u}{10}-90=30$
$\left(2x+1\right)\left(2x-9\right)$
$\frac{d}{dx}\left(x^2+y^2+2x+2y\right)=\frac{d}{dx}\left(6\right)$
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