因式分解x^3+3x^2-2x-6

熱心網(wǎng)友

x^3+3x^2-2x-6 =(x^3+3x^2)-(2x+6)=x^2(x+3)-2(x+3)=(x+3)(x^2-2)= (x+3)(x-√2)(x+√2)