Q16. W/12/P13/Q11 (i, ii)
The diagram shows the curve with equation \( y=x(x-2)^{2} \). The minimum point on the curve has coordinates \( (a, 0) \) and the \( x \)-coordinate of the maximum point is \( b \), where \( a \) and \( b \) are constants.
(i) State the value of \( a \).
[1]
(ii) Find the value of \( b \).
[4]