$4952-145+1$

$-7-\left(5+\left|-6-\left(3-2\cdot3\right)+1\right|-8\right)$

$\left(x+3\right)\left(5-x\right)+\left(x+4\right)\left(x-4\right)$

$-\frac{x^2}{36}+\frac{x^3}{49}-\frac{x^4}{64}+\frac{x^5}{81}$

$\lim_{x\to\infty}\left(\sqrt{7x^2-3x+4}-\sqrt{7x^2-4}\right)$

$2x^4-4^3-5x-2$

$\left(m+5\right)\:\left(m-8\right)$