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(x−2)² + 6² = x²

(x−2)² + 36 = x²

(x²−4x+4) + 36 = x²

x²−4x+40 = x²

−4x+40 = 0

4x = 40

x = 10

となります!
分からない事があれば遠慮なく聞いてください。

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