For any m, n ∈ n +, f (M + n) = f (m) + F (n) + 4 (M + n) - 2, f (1) = 1 1. Find the expression of F (x) 2. M ∧ 2-tm-1 ≤ f (x) for any m ∈ [- 1,1], X ∈ n + is constant, find the value range of real number t

For any m, n ∈ n +, f (M + n) = f (m) + F (n) + 4 (M + n) - 2, f (1) = 1 1. Find the expression of F (x) 2. M ∧ 2-tm-1 ≤ f (x) for any m ∈ [- 1,1], X ∈ n + is constant, find the value range of real number t

(1) F (x + 1) = f (x) + 4x + 3; so: F (2) = f (1) + 4 * 1 + 3f (3) = f (2) + 4 * 2 + 3f (4) = f (3) + 4 * 3 + 3. F (x) = f (x-1) + 4 * (x-1) + 3, f (x) = f (1) + 4 * (1 + 2 + 3 +... + (x-1)) + 3 * (x-1) = 2x & sup2; + x-22

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