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प्रश्न
Factorise by the grouping method : a2 + b - ab - a
बेरीज
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उत्तर
a2 + b - ab - a = a2 - a + b - ab
= a( a - 1) + b( 1 - a )
= a(a - 1) - b(a - 1)
= (a -1)(a - b)
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Factorisation by Grouping
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