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Question

Find the value of (7+7)(77). Is it rational?  [4 MARKS]


Solution

Concept : 1 Mark
Rationalisation : 2 Marks
Identification : 1 Mark

We have,
(7+7)(77)=72(7)2=497=42[using the identity  (a+b)(ab)=a2b2]

42 is a rational number.

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