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Question
factorise: 15(5x - 4)2 - 10(5x - 4)
Sum
Solution
15(5x - 4)2 - 10(5x - 4)
= 5(5x - 4) [3(5x - 4) - 2]
= 5 (5x - 4) (15x - 12 - 2)
= 5 (5x - 4) (15x - 14)
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Factorisation by Grouping
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