4 A curve is such that \(\frac { \mathrm { d } y } { \mathrm {~d} x } = 3 x ^ { 2 } - 4 x + 1\). The curve passes through the point \(( 1,5 )\).
- Find the equation of the curve.
- Find the set of values of \(x\) for which the gradient of the curve is positive.