SOLUTION: A function is defined by f(x)= square root of (2x+5). What is f^-1(x), the inverse of f(x)?

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Question 1111838: A function is defined by f(x)= square root of (2x+5). What is f^-1(x), the inverse of f(x)?
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
The values for x and y switch places.
sqrt%282y%2B5%29=x
2y%2B5=x%5E2
2y=x%5E2-5
y=f%5E%28-1%29%28x%29=%28x%5E2-5%29%2F2


You want ONLY the right side of the graph for x greater than or equal to 0.

graph%28300%2C300%2C-2%2C7%2C-5%2C5%2C%28x%5E2-5%29%2F2%29------NOT the left side of the graph.