Given quadratic function f (x) = ax ^ 2 + BX + 4, set a = {x | f (x) = x} If 1 belongs to a, and a is greater than or equal to 1 and less than or equal to 2, let the maximum and minimum values of F (x) in the interval [1 / 2,2] be m and m respectively, and let g (a) = M-M, and find the minimum value of G (a)

Given quadratic function f (x) = ax ^ 2 + BX + 4, set a = {x | f (x) = x} If 1 belongs to a, and a is greater than or equal to 1 and less than or equal to 2, let the maximum and minimum values of F (x) in the interval [1 / 2,2] be m and m respectively, and let g (a) = M-M, and find the minimum value of G (a)

1 belongs to a, f (1) = 1, a + B + 4 = 1, that is a + B = - 3
1=