Using an identity, find the value of
${12.1}^{2} - {7.9}^{2} .$

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Solution

The correct option is B 84
Using the identity,
$a^{2} - b^{2} = (a - b) (a + b)$

${12.1}^{2} - {7.9}^{2}$
$= (12.1 + 7.9) (12.1 - 7.9) = 20.0 \times 4.2 = 84.0 = 84$

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