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Expansion of (x^2 - y^2)

Using a 2 -...

Question

Using $a^{2} - b^{2}$ =(a+b) (a-b), find 78 x 82

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Solution

$78 \times 82 = (80 - 2) (80 + 2)$
$= 80^{2} - 2^{2}$
$= 6400 - 4 = 6396$

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