Mark M. answered • 10/02/17

Mathematics Teacher - NCLB Highly Qualified

f(x) = 1 - 6x - x

^{2}f(x) = -x

^{2}- 6x + 1f(x) = -(x

^{2}+ 6x) + 1f(x) = -(x

^{2}+ 6x + 9) + 1 + 9f(x) = -(x + 3) + 10

This is vertex form. It has the maximum.