a) \(x^2-2xy+y^2-xz+yz\)
= \(\left(x-y\right)^2-z\left(x-y\right)\)
= \(\left(x-y\right)\left(x-y-z\right)\)
b) \(x^3+9x^2-4x-36\)
= \(x^3-2x^2+11x^2-22x+18x-36\)
= \(x^2\left(x-2\right)+11x\left(x-2\right)+18\left(x-2\right)\)
= \(\left(x-2\right)\left(x^2+11x+18\right)\)
= \(\left(x-2\right)\left(x^2+2x+9x+18\right)\)
= \(\left(x-2\right)\left(x+2\right)\left(x+9\right)\)
Chuc ban hoc tot