[질문] 엑스세제곱-엑스제곱-엑스+일 인수분해좀해서알려주세요

X^3-X^2-X+1 > X^3-X-X^2+1이렇게자리바꾼뒤에앞에2개,뒤에2개씩묶어주면X(X^2-1)-(X^2-1)이렇게됩니다.그럼(X^2-1)-(X-1)이고,(X-1)(X+1)-(X-1)=X(X-1)^2가답.