| Exam Board | OCR |
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| Module | C1 (Core Mathematics 1) |
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| Topic | Quadratic Functions |
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4. (i) By completing the square, find in terms of the constant \(k\) the roots of the equation
$$x ^ { 2 } + 2 k x + 4 = 0 .$$
(ii) Hence find the exact roots of the equation
$$x ^ { 2 } + 6 x + 4 = 0 .$$