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

$3m^3+3m^2-18m$

$\lim_{x\to\infty}\left(\frac{12\cdot5^x+1}{4\cdot5^x+\frac{1}{x}}\right)$

$4\left(7x^2+8x^5+5\right)$

$\left(-ax^3-2bx^3\right)$

$\lim_{x\to3}\left(\frac{4x^2-36}{x^2+9}\right)$

$\lim_{x\to3}\left(\frac{3-x}{\sqrt{x^2-6x+9}}\right)$