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Use the formula a2 - b2 = ( a+ b) ( a-b). both side roots get cancelled you will get ans 3
2 4 2
can i know which chapter it is
i followed the surds method, according to that it is correct
number system
yes its true..

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(√5-√2)(√5+√2) is in the form of (a+b)(a-b)
it is correct na i too answered in same method but somebody is saying wrong