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प्रश्न
factorise: a2 − 3a − 40
बेरीज
उत्तर
a2 − 3a − 40
= a2 − 8a + 5a − 40
= a(a − 8) + 5(a − 8)
= (a − 8)(a + 5)
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Factorisation by Grouping
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