$f\left(x\right)=\left(2\left(\sqrt{x}+1\right)\right)\left(\frac{2-x}{x^2+3x}\right)$

$\left(2+\frac{2}{7}y^5+\sqrt{11}y^2\right)^2$

$\left(m^2-36n^2\right)^2$

$\left(2s^2-5t\right)\left(2s^2+t\right)$

$\frac{x+3}{x^2-7x+12}$

$\left(2y\:+7m\right)^3$

$5x^2y\cdot7xy$