$a2-4$

$x^2+3x+2=0$

$\int\left(\frac{40}{\left(120-x\right)}\right)dx$

$\int\left(3x^2-3x-2\right)\sqrt[3]{x}dx$

$\lim_{x\to-7}\left(4x^2+2x^5\right)$

$f\left(x\right)=3x^2+2x+6\:donde\:\frac{f\left(2\right)}{f\left(1\right)}$

$e^x\left(x+2\right)-2\left(e^x\left(x+1\right)\right)$