Answer:
The answer is the option D
[tex]x=6[/tex]
Step-by-step explanation:
we have
[tex]y=-3(x-6)^{2}+5[/tex]
This is a vertical parabola open downward
The axis of symmetry in a vertical parabola is equal to the x-coordinate of the vertex
The vertex is equal to the point [tex](6,5)[/tex]
therefore
The equation of the axis of symmetry is
[tex]x=6[/tex]
