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Homework Help: calc

Posted by matt on Friday, March 16, 2012 at 8:58pm.

consider the function f(x)=x^3 - x^2 - 3x -2. find the average slope of this function on the interval (-2,3). by the mean value theorem, we know there exists a c in the open interval (-2,3) such that f'(c) is equal to this mean slope. find the two values of c in the interval which work.

• calc - Reiny, Friday, March 16, 2012 at 9:08pm

  f(-2) = -8
  f(3) = 7
  
  average slope = (7+8)/(3+2) = 3
  
  f'(x) = 3x^2 - 2x - 3
  f'(c) = 3c^2 - 2c - 3
  
  3c^2 - 2c - 3 = 3
  3c^2 - 2c - 6 = 0
  c = (2 ± √73)/6
  = (2 ± 6√2)/6
  = 1/3± √2
  

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