Class 9 Maths Number Systems Identities related to Square root

 

Rationalize a denominator

To rationalize denominator of  1/(√a + b ) , we multiply this by  (√a + b )/ (√a + b ), where a & b are integers .  E.g.      1/(√7 – 2 )     *      (√7 + 2 )/ (√7 + 2 )   =  (√7 + 2 )/3

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