$x^2-28x+196$
$\left(-2x^5z^5\right)^2$
$\left(x+5\right)^2+\left(x+3\right)^2-2\left(x+4\right)^2-2$
$5x^3\:-\:6x^2y\:+\:7xy^2+\:6y^3\left(5x\:+\:4y\right)$
$y''+36y\:=0$
$x^2-\sqrt{3}x-18=0$
$\frac{2x^4+5x^3-2x-8}{x+3}$
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