OCR C2 June2009 Q9(iii) (a) Help!

please help me do this question. I can't seem the get the result the mark scheme sais. I differentiate 4 * k^x as (4/2x) *k^2x . I s that correct?

Sorry you've not had any responses about this. :frown:

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Spoiler

please help me do this question. I can't seem the get the result the mark scheme sais. I differentiate 4 * k^x as (4/2x) *k^2x . I s that correct?

No.

Write

k^x = e^{x \ln k}

and then differentiate that using the normal rules of differentiating exponentials, remember that

k

is just a constant.

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