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    Here's a situation I've encountered...

    I was given the equation, T = (sqrt(x^2 + 9))/3 + (7 - x)/5
    Given that x can vary, find the value of x for which there is a stationary value of T and calculate this value of T.

    I'm supposed to differentiate the equation first to get my answer but I made a mistake while doing my working and got a wrong derivative. The correct answer to getting my first derivative should be dy/dx = x/(3(x^2 + 9)^0.5) - 1/5.

    However, I know that I've messed it up and hence I get a wrong x. With the wrong x, I would get a wrong T but in this case do I still get my marks for getting T?

    I've searched online and found people saying that ECF is used when a question has multiple parts but in this case, I need to find 2 answers in 1 question. So, do I still benefit from ECF?
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    Hi there,

    While you're waiting for an answer, did you know we have 300,000 study resources that could answer your question in TSR's Learn together section?

    We have everything from Teacher Marked Essays to Mindmaps and Quizzes to help you with your work. Take a look around.

    If you're stuck on how to get started, try creating some resources. It's free to do and can help breakdown tough topics into manageable chunks. Get creating now.

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    BUMP.
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    Yeah you'll get marks for a follow-on error.

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