x3-x2-x-2 인수 분해

x3-x2-x-2 인수 분해

(x-1)(x^2+x+2)=x^3+x^2+x^2-x-2=x^3+(a-1)x^2+(2-a)x-2=0a-1=-12-a=-1 불합리(x-2+x+1)=x^3+x^2+x-2 x^2-2ax-2=x^3+(a-2)x^2+(a-2)x^2+(1-2a)x=0a-2=0a-2=-1-2a=-1x3-x2=(x-1)(x^2+x+1)