SOLUTION: Find f −1. f(x) = x2 + 9 for x ≥ 0 Please help me answer, thank you

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Question 1025903: Find f −1.
f(x) = x2 + 9 for x ≥ 0
Please help me answer, thank you
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Find f −1.
f(x) = x^2 + 9 for x ≥ 0
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Interchange x and y::
x = y^2+9 for y >= 0
Solve for "y"::
y = sqrt(x-9) for y >= 9
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graph%28400%2C400%2C-10%2C20%2C-10%2C10%2Csqrt%28x-9%29%29
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Cheers,
Stan H.