Mathematics
Junior High

X²+(X+1)²=(X+9)²
の解き方を教えてください🙏
答えは29になります

Answers

X²+(X²+2X+1)=X²+18X+81
X²-16X-80=0
(X+4)(X-20)=0
X=-4,20
29は間違えです。

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