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Expansion of (x^2 - y^2)

Factorise 49...

Question

Factorise
$49 x^{2} - 36$

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Solution

$49 x^{2} - 36$
$= {(7 x)}^{2} - 6^{2}$
$= (7 x - 6) (7 x + 6)$

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