I have to solve this question:
The quadratic function f(x) = 2x² + ax - 1 in x satisfies f(-1)≥-3 ,f(2)≥3
Let us consider the minimum value m of f(x)
(1) m can be expressed in terms of a as: m = -A/B a² - C
(2) The range of the values of a such that f(x) satisfies condition 1 is -2≤a≤4
Where A, B and C are just the blanks to fill the answers, but what i don't understand is how to express m in terms of a