Factorise: $y^{2} + 8 z x - 2 x y - 4 y z$

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Solution

$y^{2} + 8 z x - 2 x y - 4 y z = y^{2} - 2 x y + 8 z x - 4 y z = y (y - 2 x) - 4 z (y - 2 x) = (y - 4 z) (y - 2 x)$

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