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MathNet 2021 — Part 04 Question 45

Math Olympiad Vault · MathNet 2021 — Part 04

Question 45

Suppose that $P(x, y, z)$ is a homogeneous degree 4 polynomial in three variables such that $P(a, b, c) = P(b, c, a)$ and $P(a, a, b) = 0$ for all real $a, b$, and $c$. If $P(1,2,3) = 1$, compute $P(2,4,8)$.

Note: $P(x, y, z)$ is a homogeneous degree 4 polynomial if it satisfies $P(k a, k b, k c) = k^{4} P(a, b, c)$ for all real $k, a, b, c$.