How to evaluate $(98)^{2}$ using formulae with steps.

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Solution

$98^{2}$ can be written as $(100 - 2)^{2}$
$(100 - 2)^{2} = 100^{2} - 2 \times 100 \times 2 + 2^{2}$
$= 10000 - 400 + 4$
$= 9604$

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