| Exam Board | Edexcel |
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| Module | C1 (Core Mathematics 1) |
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| Topic | Quadratic Functions |
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6. (a) By completing the square, find in terms of the constant \(k\) the roots of the equation
$$x ^ { 2 } + 4 k x - k = 0$$
(b) Hence find the set of values of \(k\) for which the equation has no real roots.