College Algebra / Unit 7 Alg 376 short lesson, about 20 seconds
Rational Functions
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The idea
A rational function is a ratio of polynomial functions; its domain is every real number except the zeros of the denominator.
In practice
r(x) = (x² − 9)/(x² + 5x + 6) has denominator zeros at −2 and −3, so its domain excludes exactly those two.
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