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Evaluate each of the following using ide...

Evaluate each of the following using identities: (i)`(399)^2`(ii) `(0. 98)^2`

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(i)`(399)^2=(400-1)^2`
`=400^2+1^2-2xx400xx1`
`=160000+1-800`
`=159201`
(ii) `(0.98)^2=(1-0.02)^2`
`=1^2+(0.02)^2-2xx1xx0.02`
`=0.9964`
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