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Expansion of (x+y)^2

Using x + a...

Question

Using $(x + a) (x + b) = x^{2} + (a + b) x + a b$ , find
${12.1}^{2} - {7.9}^{2}$

A

97

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B

65

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C

34

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D

84

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Solution

The correct option is D 84
${12.1}^{2} - {7.9}^{2}$
$= (12.1 + 7.9) (12.1 - 7.9)$
$= (20) (4.2)$
$= 84$

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