| Exam Board | WJEC |
|---|
| Module | Further Unit 1 (Further Unit 1) |
|---|
| Year | 2018 |
|---|
| Session | June |
|---|
| Topic | Roots of polynomials |
|---|
6. (a) Show that \(1 - 2 \mathrm { i }\) is a root of the cubic equation \(x ^ { 3 } + 5 x ^ { 2 } - 9 x + 35 = 0\).
(b) Find the other two roots of the equation.