g: =x^2(y^2+z^2)+y(y^2+z^2)
=(y^2+z^2)(x^2+y)
h: \(=2x\left(x^2-6xy+9y^2\right)=2x\left(x-3y\right)^2\)
k: \(=2x^2+2xy+xy+y^2=\left(x+y\right)\left(2x+y\right)\)
l: \(=3x\left(x^2-2xy+y^2\right)=3x\left(x-y\right)^2\)
n: \(=x^3\left(x+1\right)+\left(x+1\right)=\left(x+1\right)\left(x^3+1\right)\)
\(=\left(x+1\right)^2\cdot\left(x^2-x+1\right)\)