Answer: derive function f(x) and you get f'(x) = 4x+ 8
Step-by-step explanation: Derivation gives a function which tells
Is original function increasing or decreasing.
When f'(x) = 0, it means that original function of second degree
Changes its direction. Now you solve 4x+8 = 0 and x=-2.
That's the minimum point in his case.