Math, asked by yash593, 1 year ago

ans fast................

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Answered by DEVILSTAR
2
(√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
StudiousSwapna: This should be the answer
rohit562: you has applied wrong identity . The identity you have used is (a-b)^2=a^2-2ab+b^2
Answered by rohit562
1
(a+b)(a-b)=a^2-b^2
(√5+2)(√5-2)=(√5)^2-2^2
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