SOLUTION: how to find the inverse of f(x)= sqrt((x^2)+8x) thanks :)

SOLUTION: how to find the inverse of f(x)= sqrt((x^2)+8x) thanks :)

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Question 262565: how to find the inverse of f(x)= sqrt((x^2)+8x) thanks :)
Answer by drk(1908) (Show Source): You can put this solution on YOUR website!
here is the original equation:

let f(x) = y and then reverse all x and y variables to get

step 1 - square both sides to get

now x^2 is a constant, so we can set = 0 as

using the quadratic formula, we get

factor a 4 out of the sqrt to get

reduce to get

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