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Applying Difference of Squares as a Product of Its Sum and Difference

The value of ...

Question

The value of ${15.8}^{2} - {4.2}^{2}$ is equal to

A

$232$

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B

$230$

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C

$236$

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D

$234$

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Solution

The correct option is A
$232$

The given expression is

${15.8}^{2} - {4.2}^{2}$ which can be written as

$= (15.8 + 4.2) (15.8 - 4.2)$

$= 20 \times 11.6$

$= 232$

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Applying Difference of Squares as a Product of Its Sum and Difference

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