[질문] 인수분해어려운문제

답변 : (x-y)(x-y-1)-2 풀이 및 해답 : (x-y)(x-y-1)-2 = (x-y)² - (x-y) - 2 = {(x-y)-2}{(x-y)+1} = (x-y-2)(x-y+1)