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Simplifying Rational Functions with Factoring and GCFs - Problem 12

Teacher/Instructor Alissa Fong
Alissa Fong

MA, Stanford University
Teaching in the San Francisco Bay Area

Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts

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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