$y^2+3y^2-6y+4y^2$

$\left(256x^4-768x^3+864x^2-432x+81\right)\left(18x+6\right)$

$\left(+6\right)\:x\:\left(-7\right)$

$\left(1-x\right)^2-\left(1+x\right)^2$

$7z-3=4$

$49x^2\:-14x\:+\:1$

$f\left(x\right)\:=\:\left(x^2+1\right)\left(3x-1\right)\left(x^5-4x^3+1\right)$