Rationalise the denominator 5/√11+4
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Step-by-step explanation:
By taking conjugate
5/√11+4 x √11-4/√11-4
= 5(√11-4)/(√11+4)(√11-4)
= 5(√11-4)/(√11-4)^2. (using identity (a+b)(a-b) =(a+b)^2)
= 5(√11-4)/11-16. ( √11^2 = 11 and 4^2 =16)
= 5(√11-4)/-5
= -(√11-4)
=4-√11
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