$\lim_{x\to-1}\left(\frac{9x^4+6x^3+8x+5}{x+1}\right)$
$\left(6n^2+4m\right)^2$
$\left(-4x+5y-3z\right)^2$
$\left(\sqrt{8}-\sqrt{3}\right)^2+2\left(\sqrt{12}\right)\left(\sqrt{2}\right)$
$x^2+5x-6\le0$
$log5\left(n^2+20n\right)=3$
$15c^4d-3cd$
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