For any quadratic function, your vertex is -b/2a
In this case, it's x=2
By factoring, you can determine the x-intercepts: y=x2-4x = x(x-4)
Your x-intercepts are the values where y=0, thus, the points (0,0) and (4,0) are the intercepts.
Your y-intercept is the point where x=0, thus (0,0) is your y-intercept.