Factorise
$a^{3} - 0.064$

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Solution

$a^{3} - 0.064 = a^{3} - {0.4}^{3} = (a - 0.4) (a^{2} + a \times 0.4 + {0.4}^{2}) = (a - 0.4) (a^{2} + 0.4 a + 0.16)$

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