Simplifying Rational Functions with Factoring and GCFs - Problem 12 322 views
You have been practicing factoring top and bottom of a fraction and crossing out common factors to simplify a rational expression. What happens if the entire top (or bottom) gets crossed out?? You need to replace it with 1. This is particularly important if your numerator crosses out entirely- you need to make sure there is a one on top of whatever is left to show that it is still in the bottom of a fraction.
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