Mathematics
Senior High
Resolved
なんで黄色マーカーのところで「4xy」が出てくるんですか?
) x+y=A, とおくと
(5)=(A+1)*-A4
={(A+1)²+A2}{(A+1)²-A²}
=(2A2+2A+1)(2A+1)
={2(x+y)²+2(x+y)+1}{2(x+y)+1}
=(2x²+4xy+2y2+2x+2y+1)(2x+2y+1)
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めっちゃ理解できました😭💓わかりやすい説明ありがとうございます🙇🏻♀️🙏🏻