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Omni-MATH / Suppose that x and y are complex numbers such that x+y=1 and that x²⁰+y²⁰=20. Find the sum of all possible values of x²+y².

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problem

Suppose that xx and yy are complex numbers such that x+y=1x+y=1 and that x20+y20=20x^{20}+y^{20}=20. Find the sum of all possible values of x2+y2x^{2}+y^{2}.
Plain-text mathematical notation (without MathML)
Suppose that x and y are complex numbers such that x+y=1 and that x²⁰+y²⁰=20. Find the sum of all possible values of x²+y².
Original LaTeX notation
Suppose that $x$ and $y$ are complex numbers such that $x+y=1$ and that $x^{20}+y^{20}=20$. Find the sum of all possible values of $x^{2}+y^{2}$.

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