graph the function using its vertex, axis of symmetry, and intercepts

Axis of symmetry is x = -b/2a

   vertex will be this value of 'x' and the 'y' value generated when substituting this value into the equation

      zeroes will be :

         factor (x-3)(x-3) = 0     only one zero   x = 3  (same as the axis of symmetry for this parabola)