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(√5+2)(√5-2)=1 is the right ans
StudiousSwapna:
(√5+2)(√5-2)=a^2 - 2ab + b ^2=(√5)^2 - 2(√5)(2) + (2)^2= 5 - 4√5 + 4= 9 - 4√5
This should be the answer
you has applied wrong identity . The identity you have used is (a-b)^2=a^2-2ab+b^2
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(a+b)(a-b)=a^2-b^2
(√5+2)(√5-2)=(√5)^2-2^2
(√5+2)(√5-2)=(√5)^2-2^2
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