Đáp án:
Giải thích các bước giải:
X^3-3x^2-9x +27 = x^2(x-3)-9(x-3)=(x-3)(x^2-9)=(x-3)^2(x+3)
3x^2-8x -16= 3x^2-12x+4x-16=(x-4)(3x+4)
3x^3 -81 = 3(x-3)(x^2+3x+9)
3x^4-24x =3x(x^3-8)=3x(x-2)(x^2+2x+4)
X^2 -6x-4y^2+9= (x^2-6x+9)-4y^2=(x-3)^2-4y^2=(x-3-2y)(x-3+2y)
X^3-9x^2+14x=x(x^2-9x+14)=x(x-2)(x-7)
5x^3-45x= 5x(x^2-9)=5x(x-3)(x+3)
X^3-y^3+x^2y-xy^2= (x-y)(x^2+xy+y^2)+xy(x-y)=(x-y)(x+y)^2
X^2-xy-7x+7y=x(x-y)-7(x-y)=(x-y)(x-7)
X^3-9x^2+14x =x(x-2)(x-7)