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7-132.

Which values of x will cause the square root expression to be undefined?

If f(x) = y, then switch the x and the y in f(x). Solve for y.

Switch the domain and range of f(x).

Substitute the equation g(x) that you found in part (b) for x in f(x).

Simplify.

See part (d). What relationship do f(x) and g(x) have with each other? (What is the relationship between two inverses?)