Posted by Jack on Wednesday, July 2, 2008 at 10:30am.
If your question is
√(9x+81) = x+5
square both sides
9x+81 = x^2 + 10x + 25
x^2 + x - 56 = 0
(x+8)(x-7) = 0
x = -8 or x = 7
A quick check will show that only x=7 is a valid answer
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