Rationalising Factors

RATIONALIZING the DENOMINATOR

The process of converting an expression whose denominator is an irrational number to an equivalent expression whose denominator is a rational number is called rationalising the denominator. To do this, we multiply and divide the expression by the rationalising factor of the denominator.

EXERCISE: Rationalise the denominators of the following:

(i)    (ii)    (iii)    (iv)  

SELF PRACTICE: Rationalise the denominators of the following:

(i) 
(ii) 
(iii) 
(iv) 

Discussion

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