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प्रश्न
Factorise: 7b2 - 8b + 1
बेरीज
उत्तर
7b2 - 8b + 1
= 7b2 - 7b - b +1
= 7b(b - 1) - 1(b - 1)
= (7b - 1)(b - 1)
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Factorisation by Grouping
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