Question 803233
{{{f(x)=-2x^2 +12x -17}}}
{{{f(x)=-2(x^2 -6x) -17}}}
{{{f(x)=-2(x^2 -6x+9-9) -17}}}
{{{f(x)=-2(x^2 -6x+9)-2(-9) -17}}}
{{{f(x)=-2(x^2 -6x+9)+18 -17}}}
{{{highlight(f(x)=-2(x-3)^2+1)}}}
The vertex is (3,1), with x=h=3 and y=k=1