zakkski8169 zakkski8169 12-01-2024 Mathematics contestada Using the completing-the-square method, find the vertex of the function f(x)=-2x²+12x+5 and indicate whether it is a minimum or a maximum and at what point A. Maximum at (-3,5) B. Minimum at (-3,5) C. Maximum at (3,23) D. Minimum at (3,23)