Mathematics
Senior High
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赤の部分の式がなぜ下の黒のようになるのか詳しく教えてください🙇🏻♀️
(3) (5)={a+(26+1)}{a² (2b+1)a+(46²-2b+1)}
d=a³+{(2b+1)-(26+1)}a²
+{(4b²-2b+1)-(2b+1)²}a
+ (26+1)(46²-26+1)
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理解できました!ありがとうございます🥺