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**Warm-up:**• Review 9.c adding and subtracting rational expressions • GET OUT YOUR 9.c NOTES!!!**Different denominators? You must build a**LCD!!! • Factor each denominator completely. • Multiply each fraction, top and bottom, by any factors from the other fraction that it is missing. • Write as one fraction BEFORE you do any multiplying out. • Multiply out numerator and collect like terms. • Factor numerator and reduce if possible.**8.d Find and Graph the Inverse of a Function or Relation**[8.8] After this lesson you will be able to… • Find and graph the inverse of a function. • Determine whether 2 functions are inverses of each other.**Inverse Functions**• An inverse function will take ananswer from the original function and “undo” it to give you back the x-value that produced the answer. • If original function is called ________ then the inverse is called _________.**Example 1:**• Let’s pick an x-value and get an answer so we can test the inverse! • Put the answer into the inverse. • You should get the original x-value back!**Building your own inverse!**• Replace f(x) with y (it is just easier to look at that way). • Switch the x and y in the equation. • Resolve the equation for y. • The result is the inverse. • Now check by using an x-value in the original!**Example 3:**• Build the inverse. • Choose an x-value to use in the original, plug answer into inverse. Did it work? • Graph the original and it’s inverse on the same graph.**Example 4:**• Build the inverse. • Choose an x-value to use in the original, plug answer into inverse. Did it work? • Graph the original and it’s inverse on the same graph.**WOW!**• Inverse functions _______________________ over ____________________!!!**Homework:**• HW ST 8.d