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A-Level C1 differentiation question

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    never seen anything like this before but just substitute the values in? What board is this?
    • Thread Starter

    Am I going insane? So the question isn't show that 4xy.... = k

    its find the value of K? I'm 99% sure its not...

    (Original post by Tobiq)
    Am I going insane? So the question isn't show that 4xy.... = k

    its find the value of K? I'm 99% sure its not...
    What exam paper and exam board is this?

    You have answered the question. You showed that solving the equation on the left hand side produces a constant result on the right hand side.
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