Given the function f (x) = (x ^ 2 + ax + 11) / (x + 1) (a ∈ R), if f (x) ≥ 3 holds for any x ∈ n *, then the minimum value of a is equal to (17 / 3)

Given the function f (x) = (x ^ 2 + ax + 11) / (x + 1) (a ∈ R), if f (x) ≥ 3 holds for any x ∈ n *, then the minimum value of a is equal to (17 / 3)

F (x) = (x + 1) + (12-A) / (x + 1) + A-2 > your answer is wrong. Simply verify that when a = 0, f (x) = (x ^ 2 + 11) / (x + 1) = (x + 1) + 12 / (x + 1) - 2 ≥ 4 √ 3-2 > 3  a = 0, for any x ∈ n *, f (x) ≥ 3, f (x) = (x + 1) + (12-A) / (x + 1) + A-2, when a ≤ 12, f (x) ≥ 2 √ (12-A