| Exam Board | CAIE |
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| Module | P1 (Pure Mathematics 1) |
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| Year | 2017 |
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| Session | November |
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| Topic | Chain Rule |
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4 The function f is such that \(\mathrm { f } ( x ) = ( 2 x - 1 ) ^ { \frac { 3 } { 2 } } - 6 x\) for \(\frac { 1 } { 2 } < x < k\), where \(k\) is a constant. Find the largest value of \(k\) for which f is a decreasing function.