Mathematics
Junior High
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途中式ありで教えてくれたら嬉しいです

(12(x+5y-1) (x-5y+1)

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✨ Best Answer ✨

(x+5y-1)(x-5y+1)
= (x+5y-1)(x-(5y-1)) ・・・①

ここで A=5y-1 とすると、

① = (x+A)(x-A)
= x²-A²
= x²-(5y-1)²
= x²-25y²+10y-1 ・・・(答え)

となります。

ありがとうございます🙇‍♂️

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