Factorise:
$2 x + 4 y - 8 x y - 1$

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Solution

2x + 4y – 8xy – 1

2x + 4y – 8xy – 1

= 2x – 1 – 8xy + 4y

= (2x – 1) – 4y (2x – 1)

= (2x – 1) (1 – 4y)

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