Homework Help Forum: math

Posted by Adrian on Wednesday, November 4, 2009 at 2:23am.

Factor completely x³-8x²+11x+20

• math - Reiny, Wednesday, November 4, 2009 at 7:51am

  try some factors of 20 I tried ±1 and sure enough -1 worked, so x+1 is a factor Then by either long division or synthetic division of x³-8x²+11x+20 by x+1 we would get x^2 - 9x + 20 which factors again into (x-4)(x-5) so x³-8x²+11x+20 = (x+1)x-4)(x-5)

  
  

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