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(a + b)^2 Expansion and Visualisation

Factorise the...

Question

Factorise the following
$81 - 64 x^{2}$

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Solution

As we know that
$a^{2} - b^{2} = (a - b) (a + b)$
$81 - 64 x^{2} = (9)^{2} - (8 x)^{2} = (9 - 8 x) (9 + 8 x)$

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