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g(f(x)) = 4x² + x
f(x)² - 1 = 4x² + x
f(x)² = 4x² + x + 1
f(x) = √4x² + x + 1
f(x - 2) = √(x - 2)² + (x - 2) +1
f(x - 2) = √x² - 4x + 4 + x - 2 + 1
f(x - 2) = √x² - 3x + 3