Compute the value of ${2.7}^{2} - {1.3}^{2}$

4.6

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5.2

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5.6

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5.8

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Solution

The correct option is C
5.6

The given expression is

${2.7}^{2} - {1.3}^{2}$ which can be written as

$= (2.7 + 1.3) (2.7 - 1.3) [a^{2} - b^{2} = (a + b) (a - b)]$

$= 4 \times 1.4$

$= 5.6$

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