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2014-06-24T14:28:09+03:00
(x+3)³ - 25x - 75 =
= (x+3)³ - 25 ( x+3)
= (x+3) [ (x+3)² - 25 ]
= (x+3) (x+3-5) (x+3+5)
= (x+3) (x-2) (x+8)
3 5 3