Hi,
the vertex form of a parabola,where(h,k) is the vertex
y < -x^2 + 12x -36
y < -1(x^2 - 12x + 36)
y < -1(x-6)^2 vertex is Pt(6,0) a = -1 ( a is negative so parabola opens downward
Solved by pluggable solver: Plot Any Inequality Graphing function :