b: =(x-3)(x-4)
c: \(=3x^2-6x-x+2=\left(x-2\right)\left(3x-1\right)\)
d: \(=x^3+3x-x-3\)
\(=x\left(x-1\right)\left(x+1\right)+3\left(x-1\right)\)
\(=\left(x-1\right)\left(x^2+x+3\right)\)
e: \(=x^3+x^2+4x^2+4x+4x+4\)
\(=\left(x+1\right)\cdot\left(x^2+4x+4\right)=\left(x+1\right)\left(x+2\right)^2\)