F (x) = x ^ 2-2ax + 2. X ∈ [- 1.1] to find the minimum value of function

F (x) = x ^ 2-2ax + 2. X ∈ [- 1.1] to find the minimum value of function

The minimum value of the parabola with the opening upward should be discussed in terms of the symmetry axis on the left, middle and right of the interval. ① A1, the minimum value is f (1)