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Rational functions are of the form

r(x) = f(x)/g(x).

Where f(x) and g(x) are polynomial functions .


Since g(x) is in the denominator,

Domain of r(x) is where g(x)≠ 0


For example

If r(x) = 1/x

then, Domain of r(x) is all real numbers except 0

So, r(x) is defined from R – {0} –> R


Let us discuss r(x) = 1/x in the next question

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Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths and Science at Teachoo.