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# Is "Error Carried Forward" applicable here? watch

1. 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?
2. Hi there,

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

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