$\left(4mn^3-\frac{1}{5}m^2n^2+5m^3n\right).\left(25m^4\right)$

$\lim_{x\to2}\left(\frac{x^3-8}{4x^3-x-29}\right)$

$3\left(x+2y\right)\left(x+3\right)\left(2y+3\right)$

$4a^3w+20a^2w^2+25aw^3$

$\left(x^4+5x^3-15x+9\right)^2$

$\left(7a-3b\right)\left(a+5b\right)$

$\lim_{x\to1}\left(x^3-5x^2+7x-3x^2+15x+25\right)$