$\lim_{x\to0}\left(\frac{3x^2-3x+9}{x}\right)$
$\left(2x+5\right)\left(2x+4\right)$
$3x^21-241^2$
$\text{left}\left(5x-4y\text{right}\right)\text{left}\left(7x^{2-12x+27}\right)$
$\left(\frac{3}{4}+\frac{1}{5}\right)^2$
$4x^2+28x+45=0$
$t^2-2t\cdot5z+\left(5z\right)^2$
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