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maka :
f(x) = x² - 2x - 3
⇒ y = x² - 2x - 3 + 4
⇒ y = (x - 1)² + 4
⇒ (x - 1)² = y + 4
⇒ x - 1 =
⇒ x = + 1
⇒ f ⁻ ₁ (x) =