$x\left(2\right)+18x+81$
$\left(2x+5\right)\left(x^2-9\right)$
$\left(18x-48\right)\cdot\left(\frac{1}{4}x^2-\frac{5}{4}x+\frac{25}{16}\right)$
$121y^{10}-4x^8$
$\lim_{x\to0}\left(\frac{\sin^2\left(x\right)}{x^3}\right)$
$-\left(7x^2+3y\right)\left(7x-3y\right)$
$6x^2+3a^2=12$
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