7 The equation of a curve is \(2 x ^ { 3 } + y ^ { 3 } = 24\).
- Express \(\frac { \mathrm { d } y } { \mathrm {~d} x }\) in terms of \(x\) and \(y\), and show that the gradient of the curve is never positive.
- Find the coordinates of the two points on the curve at which the gradient is - 2 .