Question: Given that f(x) = 3x 1, g(x) = x + 4 and fg(x) = gf(x), where x R, show that x x

Given that f(x) = 3x − 1, g(x) = x² + 4 and fg(x) = gf(x), where x ∈ R, show that x² − x − 1 = 0.

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