Using $a^{2} - b^{2} = (a + b) (a - b),$ find
$12^{2} - 8^{2}$

80

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84

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88

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Solution

The correct option is A $80$
$12^{2} - 8^{2} = (12 + 8) (12 - 8)$
$[U s i n g i d e n t i t y (a - b) (a + b) = a^{2} - b^{2}]$
$= 20.0 \times 4 = 80$

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