( $98^{2}$ ) = . (Evaluate using identities.)

9804

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9604

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9984

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9544

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Solution

The correct option is B 9604
Using the identity,
$(a - b)^{2} = a^{2} - 2 a b + b^{2}$ ,
$\Rightarrow$ $98^{2}$ = $(100 - 2)^{2}$
= $100^{2} - 2 \times (100) \times (- 2) + 2^{2}$
=10000-400 + 4
=9604

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