[질문] (x+1)(x+2)(x+3) 이거전개어떻게하죠?답만말고왜!!어떻게하는지...ㅎㅎ

(x+1)(x+2)(x+3)=(x제곱+2x+x+2)(x+3)=(x제곱+3x+2)(x+3)=(x세제곱+3x제곱+3x제곱+9x+2x+6)=x세제곱 + 6x제곱 + 11x + 6 입니다.