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Evaluate each of the following by using ...

Evaluate each of the following by using identities: (i)`(0. 99)^2` (ii) `185 xx185-115xx 115`

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(i)`(0.99)^2`
`= (1-0.01)^2= 12- (2xx1xx0.01) + (0.01)^2`
`= 1-0.02 +0.0001`
`= 0.9801`
(ii)`(185)^2- (115)^2= ( 185-115) (185+115)`
`= 70×300= 21000`
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