| Exam Board | WJEC |
|---|
| Module | Further Unit 1 (Further Unit 1) |
|---|
| Year | 2019 |
|---|
| Session | June |
|---|
| Topic | Roots of polynomials |
|---|
5. Given that \(x = - \frac { 1 } { 2 }\) and \(x = - 3\) are two roots of the equation
$$2 x ^ { 4 } - x ^ { 3 } - 15 x ^ { 2 } + 23 x + 15 = 0$$
find the remaining roots.