Factorise Completely : $2 - 8 x^{2}$

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Solution

$2 - 8 x^{2} = 2 (1 - 4 x^{2}) = 2 [(1)^{2} - (2 x)^{2}] = 2 (1 + 2 x) (1 - 2 x)$

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Factorise :

$(i) 9 x^{3} - 6 x^{2} + 12 x (i i) 8 x^{2} - 72 x y + 12 x (i i i) 18 a^{3} b^{3} - 27 a^{2} b^{3} + 36 a^{3} b^{2}$

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