Cubic Equation - MaplePrimes

Question:Cubic Equation

Posted: yangtheary 280 Product: Maple

September 17 2013

0

If $x_{1},x_{2},x_{3}>0$ are the roots of the equations $ax^3+bx^2+cx+d=0$ .
Prove that min $(x_{1}^7+x_{2}^7+x_{3}^7)=\frac{-b^3c^2}{81a^5}$

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