$\lim_{x\to-1}\left(\frac{x^4+3x^3+7x+9}{x+1}\right)$

$\frac{6x^2-10x-24}{2x-3}$

$\left(-7x^3-1+2x^{-2}\right)\left(2x^2-3\right)$

$\left(-3\:s\:+\:2\:t\right)\left(4\:s-t\right)$

$\lim_{x\to4}\left(\frac{\sqrt{5x}-\sqrt{6x-4}}{x-4}\right)$

$\left(m-3\right)\left(m-5\right)$

$\lim_{x\to5}\:\:\left(\frac{x^2-7x+10}{x^2-10x-8}\right)$