[질문] 중3학년1학기다항식곱셈식좀알아주세요

(a+b)²=a²+2ab+b²/(a-b)²=a²-2ab+b²/(a+b)(a-b)=a²-b²/(x+a)(x+b)=x²+(a+b)x+ab/(ax+b)(cx+d)=acx²+(ad+bc)x+bd 입니다^^