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