How Do You Find The Inverse Of A Function?

Let’s cut right to the chase on this one.  If you have the function f(x)= 3x+5, this is how you find its inverse.

1.  Rewrite it as y=3x+5

2.  Change the y to x.  Change the x to y.  That gives you x=3y+5.

3.  Solve this new equation for y.  3y= x-5.  Then divide by 3.  y=(x-5)/3.  This is the inverse.

If you look at the graph of a function, you can find its inverse by reflecting (flipping) the graph over the line y=x.  The resulting graph is the inverse of the original function.  More about functions tomorrow.

Any questions or special problem?  Email me for a personalized video to answer your question.


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