Test Academy | Let f: |2, ∞) → R be the function defined by f(x) – x² – 4x + 5, then the range of f is R, [1, ∞), [4, ∞), [5, ∞)

Question

Let f: |2, ∞) → R be the function defined by f(x) – x² – 4x + 5, then the range of f is

Options :

R
[1, ∞)
[4, ∞)
[5, ∞)

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