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प्रश्न
factorise: x2 - x - 72
बेरीज
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उत्तर
x2 - x - 72
= x2 - 9x + 8x - 72
= x(x - 9) + 8(x - 9)
= (x - 9)(x + 8)
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Factorisation by Grouping
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