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September 21, 2014

September 21, 2014

Posted by **David** on Thursday, April 1, 2010 at 11:03pm.

- Math -
**Reiny**, Thursday, April 1, 2010 at 11:16pmI will assume you meant

f(x) = 4x^3 – 6x^2 – 24x

then

f'(x) = 12x^2-12x - 24

= 0

divide by 12

x^2 - x - 2 = 0

(x-2)(x+1) = 0

x = 2 or x = -1

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