$2x^2\:-\:3x\:+\:2,\:para\:x=-1$

$\lim_{x\to\infty}\left(1+\frac{\left(8.2x^2+6.3x+5.6\right)}{\left(4.3x^2+4.8x+6.8\right)}\right)$

$\left(2x+\frac{2}{3}\right)^2$

$\frac{dy}{dx}=4y+1$

$\left|-23-\left(-7\right)\right|$

$7^{9\:}.\:7-4$

$a\left(x\right)\:=\:\left(x+4\right)\left(x-2\right)$