| Exam Board | AQA |
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| Module | AS Paper 2 (AS Paper 2) |
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| Year | 2022 |
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| Session | June |
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| Topic | Chain Rule |
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3 A curve has equation \(y = k \sqrt { x }\) where \(k\) is a constant.
Find \(\frac { \mathrm { d } ^ { 2 } y } { \mathrm {~d} x ^ { 2 } }\) at the point \(( 4,2 k )\) on the curve, giving your answer as an expression in terms of \(k\).