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प्रश्न
factorise: 12(a + b)2 - (a+ b) - 35
बेरीज
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उत्तर
12(a + b)2 - (a+ b) - 35
= 12 (a + b)2 - 21 (a + b) + 20 (a + b) - 7
= 3(a + b) [4 (a + b) - 7] + 5[4 (a + b) - 7]
= (4a + 4b - 7)(3a + 3b + 5)
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Factorisation by Grouping
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