A problem of mathematical function in grade one of senior high school The known function f (x) = (- ax ^ 2 + ax + 1) / 2x, X ∈ [1, + ∞) (1) When a = - 2, find the minimum value of function f (x) (2) If f (x) > 0 holds for any x ∈ [1, + ∞), try to find the value range of real number a

A problem of mathematical function in grade one of senior high school The known function f (x) = (- ax ^ 2 + ax + 1) / 2x, X ∈ [1, + ∞) (1) When a = - 2, find the minimum value of function f (x) (2) If f (x) > 0 holds for any x ∈ [1, + ∞), try to find the value range of real number a

Because x is 1, it is simple. Direct division: (1) f (x) = x + 2 + 1 / 2x 2 + radical 2
The second question is almost the same. I don't want to write any more. I'll write it myself