| Exam Board | Edexcel |
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| Module | C1 (Core Mathematics 1) |
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| Year | 2015 |
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| Session | June |
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| Topic | Exponential Functions |
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- Given that \(y = 2 ^ { x }\),
- express \(4 ^ { x }\) in terms of \(y\).
- Hence, or otherwise, solve
$$8 \left( 4 ^ { x } \right) - 9 \left( 2 ^ { x } \right) + 1 = 0$$