Inverse functions

The inverse of a function reverses what it does: if f(x) = 2x + 1, then f(2) = 5, and its inverse, f^-1(x) = (x-1)/2, turns 5 back into 2, since f^-1(5) = (5-1)/2 = 2. You can find an inverse algebraically by solving y = f(x) for x; not every function has one unless it only hits each output once.

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