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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 has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.