| Exam Board | OCR MEI |
|---|
| Module | C2 (Core Mathematics 2) |
|---|
| Year | 2009 |
|---|
| Session | June |
|---|
| Topic | Differentiation Applications |
|---|
| Type | Find stationary points |
|---|
6 Use calculus to find the \(x\)-coordinates of the turning points of the curve \(y = x ^ { 3 } - 6 x ^ { 2 } - 15 x\). Hence find the set of values of \(x\) for which \(x ^ { 3 } - 6 x ^ { 2 } - 15 x\) is an increasing function.