Sum
factorise: 6 + 7b - 3b2
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Solution
6 + 7b - 3b2
= 6 + 9b - 2b - 3b2
= 3(2 + 3b) - b(2 + 3b)
= (2 + 3b)(3 - b)
Concept: Factorisation by Grouping
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