factorise(x-2y)(x-2y) +4x-8y
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x square - 2xy - 2xy + 4y square + 4x - 8y
(x square - 4xy + 4y square) + 4x - 8y
(x-2y) square + 4 (x-2y)
factor out x-2y from the expression
(x-2y)(x-2y+4)
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