$4x^2+28x-4$
$\left(x+1\right)^2+m\left(x+1\right)-y\left(x+1\right)$
$\frac{\left(n^2+4\right)}{8n-2n^3}$
$cosy+seny=\frac{\sqrt{6}}{2}$
$21\cdot u^{20}\cdot\left(-3z\right)$
$10x^2-9x+50=0$
$\int\frac{10x^3}{\sqrt{x^2+9}}dx$
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