which equation represents the vertex form of the equation y=x^2-20x+104?

From the graph above, the vertex of the graph (h,k) is (10,4).
The general equation in its vertex form is,
[tex]y=(x-h)^2+k[/tex]Therefore,
[tex]y=(x-10)^2+4[/tex]Hence, option D is the correct answer.