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प्रश्न
factorise: 1 - 18x - 63x2
बेरीज
उत्तर
1 - 18x - 63x2
= 1 - 21x + 3x - 63x2
= 1 (1 - 21x) + 3x (1 - 21x)
= (1 - 21 x) (1 + 3x)
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Factorisation by Grouping
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