Question

a) x³-x+2y-8y³

b) 2x³-8x²-24x+54

giúp mình với

 

Answer 1

a: =(x^3-8y^3)-(x-2y)

=(x-2y)(x^2+2xy+4y^2)-(x-2y)

=(x-2y)(x^2+2xy+4y^2-1)

b: =2(x^3-4x^2-12x+27)

=2[(x+3)(x^2-3x+9)-4x(x+3)]

=2(x+3)(x^2-7x+9)