Plzz solve (II) and (III)..

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What is development.
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1664 +2
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1. (a+b) 2 put this identities
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{20+0.6} =a^2 + 2ab + b^2
= {20}^2 + 2{20} {0.6} +{0.6}^2
= 400 + 24 +0.36
= 424.26
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What are you looking for?