A curve passes through (0, 11) and has an equation for which \(\frac{dy}{dx} = ax^2 + bx - 4\), where \(a\) and \(b\) are constants.

(i) Find the equation of the curve in terms of \(a\) and \(b\).

(ii) It is now given that the curve has a stationary point at (2, 3). Find the values of \(a\) and \(b\).