using the identity (a-b)^2 =(a^2-2ab+b^2) evaluate (491)^2
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(500 - 9) ^2
= (500)^2 + (2)^-2(500)(2)
=250000 + 4 - 2 (1000)
= 250004 - 2000
= 248004..
Please mark me BRAINLIST answer...
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