Question 1114607
Notice the function is a perfect square trinomial!  The vertex (maximum point) occurs in <s>the exact middle of the two zeros of the function,..</s>. exactly one point.


If the function makes sense for a "profit".
{{{f(x)=-1(x^2-8x+16)}}}
{{{f(x)=-1(x-4)^2}}}-----vertex form for the parabola
and the maximum is at the point,  (4,0).


Whatever is being manufactured is a money loser.