What do you need completing the square for?
a = -2, b = 12 now evaluate.
Remember Min/Max is
You don't need to factor.
without graphing , whether the given quad function has a maximum or minimum value and then find it's value.
Here's the problem
f(x) = -2x^2+12x
I tried completing the square, but it doesn't work.
-2x^2 + 12x take 12/2+ 6 ^2 + 36 = (-2x^2+12x+36)
Factor out -2(x^2-6x-18) and the problem doesn't factor from here. What am I missing?