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All the roots of the cubic polynomial f(x)-3x^3+bx^2+cx+d are negative real numbers. If f(0)=81, find the smallest possible value of f(1). Prove that your answer is the minimum
 Jun 15, 2021
 #1
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The smallest possible value of f(1) is 145.

 Jun 15, 2021
 #2
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As follows:

 

 Jun 16, 2021

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