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  • 22-05-2017
  • Mathematics
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Аноним Аноним
  • 22-05-2017
first multiply the contents of the second bracket by  d then do the same procees using - 3

(d - 3)(d + 9)

= d^2 + 9d - 3d - 27

= d^2 + 6d - 27
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