Evaluate each of the following using identities:
(i) (399)2
(ii) (0.98)2
(iii) 991×1009
(iv) 117×83
(i) We will use the identity, (a-b)2 = a2 + b2 – 2ab
(ii) We will use the identity, (a-b)2 = a2 + b2 – 2ab
(iii) We will use the identity, (a-b)(a+b)= a2 - b2
(iv) We will use the identity, (a-b) (a+b)= a2 - b2
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