SOLUTION: Please solve s+3sqrt of s-40=0 Thank you

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Question 297207: Please solve
s+3sqrt of s-40=0
Thank you
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
s%2B3sqrt%28s%29-40=0
Sub x for sqrt(s)
x%5E2+%2B+3x+-+40+=+0
(x+8)*(x-5) = 0
x =-8 --> s = 64 extraneous, doesn't work
x = 5 --> s = 25