What is the horizontal line rule?  It's a variation of the vertical line test, of course.  Find out what it means to take the inverse of a function and restrict the domain.


  • Notes: Inverse of a Function


  • p51 #1-6, 8, 9, 12, 15, 20, 21 C1 C2 C3

Things you should know after today:

  • how to find the equation for the inverse of a function
  • how the coordinates of a function, f(x), are related to the coordinates of the inverse function, f-1(x)
  • how the graphs of a function and its inverse are like reflections
  • how the line y=x is important to reflections, functions and their inverse
  • the horizontal line rule
  • why a domain is restricted when making an inverse
  • determine what happens when you do f(f -1(x))
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