Question

Phân tích đa thức thành nhân tử

a,x^2+8x+16

b,x^3-6x^2+12x-8

Answer 1

a) \(x^2+8x+16=\left(x+4\right)^2=\left(x+4\right)\left(x+4\right)\)

b) \(x^3-6x^2+12x-8=\left(x-2\right)^3=\left(x-2\right)\left(x-2\right)\left(x-2\right)\)

Answer 2

a) x^2 + 8x +16 = x^2 +2.x.4 +4^2 = (x +4)²

b)x^3 -6x^2 + 12x -8 = x^3 - 3.x^2.2 + 3.x.2^2 - 2^3

=(x-2)³