| Exam Board | Edexcel |
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| Module | C2 (Core Mathematics 2) |
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| Year | 2014 |
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| Session | June |
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| Topic | Exponential Equations & Modelling |
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8. (i) Solve
$$5 ^ { y } = 8$$
giving your answer to 3 significant figures.
(ii) Use algebra to find the values of \(x\) for which
$$\log _ { 2 } ( x + 15 ) - 4 = \frac { 1 } { 2 } \log _ { 2 } x$$