Find the minimum value of the function f (x) = x2 + ax + 3 in the interval - 1,1 The expression "includes - 1 and 1

Find the minimum value of the function f (x) = x2 + ax + 3 in the interval - 1,1 The expression "includes - 1 and 1

f(x)=[x-(-a/2)]^2-a^2/4+3
If - A / 22
Then the domain of definition is on the right side of the axis of symmetry and is an increasing function
So the minimum value = f (- 1) = 1-A + 3 = 4-a
If - 1