Mathematics
Senior High
問題は「次の式を展開しxについて降べきの順に整理せよ。」で、写真の黒が私、赤が答えです。
なぜ緑の部分をマイナスでくくるかが分からないので教えてください🙇♂️
(x*+ 2ax +1)(z-2a)
= *+ 2ax+ x - 2aズ-4a'x-2a
= *+(1-4a)x - 2a
3
答え
ピ -(4a-10x- 2a
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