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Sum
factorise: 15(5x - 4)2 - 10(5x - 4)
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Solution
15(5x - 4)2 - 10(5x - 4)
= 5(5x - 4) [3(5x - 4)2 - 2]
= 5 (5x - 4) [3 (25x2 - 40x + 16) - 2]
= 5(5x - 4) (75x2 - 120x + 46)
Concept: Factorisation by Grouping
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