[질문] x제곱+3x+2+2xy+3y+y제곱을인수분해하여라

(x² -2xy+y²) - (3x-3y) (x-y)² -3(x-y) A=x-y로 하면 A제곱 -3A =A(A-3) 풀어쓰면 (x-y)(x-y-3) 답 : (x-y)(x-y-3)