Homework Help: Calculus

Posted by Si on Friday, April 9, 2010 at 3:47pm.

Find the average or mean slope of 2x^3 - 6x^2 - 90x +3 on the interval [-6,10]?

By the Mean Value Theorem, we know there exists at least one c in the open interval ( -6 , 10 ) such that f'( c) is equal to this mean slope.

::>> I already found the mean slope of the function which is 38. Now I'm trying to find "c". I can't get c.

Calculus - Damon, Friday, April 9, 2010 at 4:18pm
6x^2 - 12 x -90 = 38 ??? assuming your 38 is correct

6 x^2 - 12 x - 128 = 0
3x^2 - 6 x - 64 = 0

x =5.73

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