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Omni-MATH / For a a positive real number, let x₁,x₂,x₃ be the roots of the equation x³−ax²+ax−a=0. Determine the smallest possible value of x₁³+x₂³+x₃³−3x₁x₂x₃.

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problem

For aa a positive real number, let x1,x2,x3x_{1}, x_{2}, x_{3} be the roots of the equation x3−ax2+ax−a=0x^{3}-a x^{2}+a x-a=0. Determine the smallest possible value of x13+x23+x33−3x1x2x3x_{1}^{3}+x_{2}^{3}+x_{3}^{3}-3 x_{1} x_{2} x_{3}.
Plain-text mathematical notation (without MathML)
For a a positive real number, let x₁,x₂,x₃ be the roots of the equation x³−ax²+ax−a=0. Determine the smallest possible value of x₁³+x₂³+x₃³−3x₁x₂x₃.
Original LaTeX notation
For $a$ a positive real number, let $x_{1}, x_{2}, x_{3}$ be the roots of the equation $x^{3}-a x^{2}+a x-a=0$. Determine the smallest possible value of $x_{1}^{3}+x_{2}^{3}+x_{3}^{3}-3 x_{1} x_{2} x_{3}$.

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