If \(\sqrt{x^2 + 9}\) = x + 1, solve for x
\(\sqrt{x^2 + 9}\) = x + 1 x\(^2\) + 9 = (x + 1)\(^2\) 0 = x\(^2\) + 2x + 1 - x\(^2\) - 9 = 2x - 8 = 0 2(x - 4) = 0 x = 4
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