F (x) = x2 + 4x + 3, t ∈ R, the function g (T) represents the minimum value of function f (x) in the interval [T, t + 1], and the expression of G (T) is obtained

F (x) = (x + 2) ^ 2-1, the axis of symmetry is x = - 2
When t + 1-2, G (T) = f (T) = T ^ 2 + 4T + 3
Dang-3

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