Mathematics
Senior High
Solved
この問題の二段目なのですがなぜ4が-4に変わるのでしょうか。
解説お願いします🙏
(7) 46-12-(b-3)° = -(b-3)° +4(b-3)
= ー(6-3){(6-3)?-4}
=ー(6-3){(b-3)+2}{(b-3)-2}
=-(6-1)(6-3)(b-5)
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