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Question
factorise: x2y2 - 3xy - 40
Sum
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Solution
x2y2 - 3xy - 40
= x2y2 - 8xy + 5xy - 40
= xy (xy - 8) + 5 (xy - 8)
= (xy - 8)(xy + 5)
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Factorisation by Grouping
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