$\left(x^3-2x^2+9\right)x+2$

$\left(7x-y^2\right)^2$

$\left(\left(2a^2\right)^{-3}b^4\right)^{-3}$

$16x^2-56x+48$

$\left(\frac{3}{5}z^{10}-2z^5\right)\left(\frac{3}{5}z^{10}+2z^5\right)$

$\frac{1-b^2}{\left(1+bx\right)2+\left(b+x\right)2}$

$\frac{du}{dt}=e^{2u+9t}\:\:u\left(0\right)=7$