$\lim_{x\to4}\left(\frac{\left|x^2-3x-4\right|+2x-8}{\sqrt{x}-2}\right)$

$\int-\frac{\left(x+1\right)}{\left(x^2+3\right)}dx$

$2x\left(8x^2-20\right)^2$

$\lim_{x\to0}\left(\frac{\sin\left(x\right)}{e^{3t}-1}\right)$

$2^{10}-2^1$

$\left(5x-2\right)\left(5x-b\right)$

$2\left(x-4\right)\left(x+4\right)+\frac{3}{2}\left(x+\frac{1}{3}\right)\:^2$