In this lesson on subtracting rational expressions with a common denominator, we learn to use the distributive property and simplify the numerator by factoring, canceling only when possible. While we subtract numerators and write the difference over the common denominator, we must remember not to leave a 1 in the denominator. The lesson also explores canceling when there are opposite expressions in the numerator and the importance of factoring.
How to subtract rational expressions that already have a common denominator, and how to simplify if it is possible to cancel.
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