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प्रश्न
Factorise : xy - ay - ax + a2 + bx - ab
बेरीज
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उत्तर
xy - ay - ax + a2 + bx - ab
= y (x - a) - a (x - a) + b (x - a)
= (x - a) (y - a + b)
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Factorisation by Grouping
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