因式分解:x^3+6x^2+12x+9
问题描述:
因式分解:x^3+6x^2+12x+9
答
x^3+6x^2+12x+9
= x^2(x+3) + 3x^2+12x+9
= x^2(x+3) + 3x(x+3) + 3(x+3)
= (x^2+3x+3)(x+3)