EXAMPLE 1 Finding the Domain of a Rational Function 2r? – 4 (a) The domain of R(x) is the set of all real numbers x except -5; that x + 5 is, the domain is {x\x # -5}. SECTION 4.4 Properties of Rational Functions 217 1. (b) The domain of R(x) - is the set of all real numbers x except –2 and 2; x? - 4 that is, the domain is {x|x # -2, x # 2}. is the set of all real numbers. x* +1 x² - is the set of all real numbers x except 1; that is, (c) The domain of R(x) (d) The domain of R(x) x - 1 the domain is {x | x + 1}.

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