$\left(2-3\left(x+2\right)\right)^4\:\cdot\:x^3$

$\frac{\left(x^4-2x^3+3x^2-5x+10\right)}{x^2+4}$

$\log\left(3x+1\right)+\log\left(4\right)=\log\left(11x+12\right)$

$257^2$

$\left(u+2\right)\left(u-2\right)\left(u^2+4\right)$

$\left(-8\cdot9\right)+\left(7\cdot5\right)$

$6a^3b^3-24b^2b^5$