15x²-x-28 factorise it
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given us that
15x² - x - 28
= 15x² - ( 21 - 20 )x - 28
= 15x² - 21x + 20x - 28
= 3x ( 5x - 7 ) + 4 ( 5x - 7 )
= ( 3x + 4 ) ( 5x - 7 )
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