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Factorisation by Common Factors

Factorize the...

Question

Factorize the following:
$(16 - 81 x^{2})$

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Solution

Simplifying $16 - 81 x^{2}$

$16 - 81 x^{2}$

$= {(4)}^{2} - {(9 x)}^{2}$

$= (4 + 9 x) (4 - 9 x)$

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