$a - b$ times $a + b$ is equal to

a^{2} - b^{2} - 2 a b

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a^{2} - b^{2} + 2 a b

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a^{2} - b^{2}

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Solution

The correct option is C $a^{2} - b^{2}$
Applying First Out Inside Last (FOIL) technique,

$= a \times a + a \times b - b \times a - b \times b$
$= a^{2} + a b - a b - b^{2}$
$= a^{2} + 0 - b^{2}$
$= a^{2} - b^{2}$

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