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Question
factorise: 5x2 - 4xy - 12y2
Sum
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Solution
5x2 - 4xy - 12y2
= 5x2 - 10xy + 6xy - 12y2
= 5x (x - 2y) + 6y (x - 2y)
= (x - 2y)(5x + 6y)
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Factorisation by Grouping
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