Inverse Functions - Cool math Algebra Help Lessons - What Are Inverse Functions and What Do They Do?

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Coolmath Algebra
Inverse Functions Lesson 1 - What Are They and What Do They Do? (page 3 of 3)
---- This algebra lesson explains the concept of inverse functions

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What if we try sticking a negative number in?

-3 -> ( )^2 -> 9 -> square root( ) -> 3

A -3 went in... but, a 3 came out! These don't work for negative numbers. So, for this one, we have to say

These are inverse functions only when

g( x ) = square root( x )

(This will be even clearer later.)

The official notation for the inverse function of a guy named f(x) is

(read as "f inverse of x.")

* The little "-1" is NOT an exponent! It's just a notation. Hey -- they didn't ask ME about this stuff when they made it up!

I know you're really excited about this... But, you don't know enough to try any problems yet. Keep reading!

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