$s^2+9s+4$
$\frac{d}{dx}-7x^5+8x^4-9x^2-7x$
$\lim_{x\to0}\left(\frac{e^x-\log_e\left(x+1\right)-1}{x^2}\right)$
$\left(9a-5y\right)\left(2a+3y\right)$
$x^3-x^2-6x=0$
$\sqrt[4]{b^{-4}}+4\sqrt[4]{b^{-8}}-5\sqrt[4]{b^{12}}$
$3x-8\le\:23$
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