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- Feb 14, 2012

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\(\displaystyle f''(x)=12x^2+54x+2c\)

Requiring the discriminant to be positive gives us:

\(\displaystyle 54^2-4(12)(2c)>0\)

\(\displaystyle c<\frac{243}{8}\)

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- Feb 14, 2012

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Hi **MarkFL**,

Thanks for participating and your answer is correct!

Thanks for participating and your answer is correct!