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MathNet 2023-part-04 — 191 problems (EN–VI) Question 16

Math Olympiad Vault · MathNet 2023-part-04 — 191 problems (EN–VI)

Question 16

Let $a$, $b$, and $c$ be real numbers.
(1)
Show that if $a^2 + b^2 = c^2$ and $a^3 + b^3 = c^3$, then either $a = 0$ or $b = 0$.

(2)
Show that if $a^3 + b^3 = c^3$ and $a^4 + b^4 = c^4$, then either $a = 0$ or $b = 0$.