Question

factorise the 9x2-21x-8

Answer 1

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Answer 2

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9x^2 - 21x - 8

= 9x^2 + 3x - 24x - 8

= 3x ( 3x + 1 ) - 8 ( 3x + 1 )

= ( 3x + 1 ) ( 3x - 8 )

Hope it helps.....