Find ${12.1}^{2} - {7.9}^{2}$ .

80

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84

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88

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Solution

The correct option is B $84$
${12.1}^{2} - {7.9}^{2}$

$= (12.1 + 7.9) (12.1 - 7.9)$
Using identity $(a - b) (a + b) = a^{2} - b^{2}$

$= 20.0 \times 4.2 = 84.0 = 84$

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