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College Algebra / Unit 2   Alg 108 short lesson, about 20 seconds

Multiplying Rational Expressions

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The idea

Rational expressions multiply straight across — numerator times numerator over denominator times denominator — with factoring and canceling first to keep results small.

In practice

(2/x) · (x²/4): the x and the 2 cancel across, leaving x/2. At x = 2, both sides equal 1. Factor before multiplying and the canceling does the work.

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