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Find the value

Source: BdMO 2024 Secondary National P3

March 18, 2024
algebraequation

Problem Statement

Let aa and bb be real numbers such thataa25=b5b2=aba2b25\frac{a}{a^2-5} = \frac{b}{5-b^2} = \frac{ab}{a^2b^2-5}where a+b0a+b \neq 0. a4+b4=a^4 + b^4 = ?