Question 2(iii)
Factorise
$49 x^{2} - 36$

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Solution

$49 x^{2} - 36 = (7 x)^{2} - (6)^{2} = (7 x - 6) (7 x + 6) [a^{2} - b^{2} = (a - b) (a + b)]$

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