Using the completing-the-square method, find the vertex of the function f(x) = 2x2 − 8x + 6 and indicate whether it is a minimum or a maximum and at what point.

maximum at (2, –2)
minimum at (2, –2)
maximum at (2, 6)
minimum at (2, 6)

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

Someone answer asap for ! the boiling point of water at an elevation of 0 feet is 212 degrees fahrenheit (°f). for every 1,000 feet of increase in elevation, the boiling point of water decreases by about 2°f. which of the following represents this relationship if b is the boiling point of water at an elevation of e thousand feet? a. e = 2b - 212 b. b = 2e - 212 c. e = -2b + 212 d. b = -2e + 212

Which is f(5) for the function –2x2 + 2x - 3?