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# C4 Indices Question watch

1. Just need someone to explain this question from the 2007 Jan paper.

I don't get part b) of the question, and how you can use part a) to help you figure part b out.

Does it simply become e^((x^2)ln2)

Attached Images

2. Set u = x^2 and use the chain rule
3. (Original post by ArchedEdge)
Just need someone to explain this question from the 2007 Jan paper.

I don't get part b) of the question, and how you can use part a) to help you figure part b out.

Does it simply become e^((x^2)ln2)

Is the working on the image by you? or is that the mark scheme? It looks right to me...
4. (Original post by sonofdot)
Set u = x^2 and use the chain rule
Ah, it's late at night, what would be dy/du?

EDIT: Got it, thanks

(Original post by josh_a_y)
Is the working on the image by you? or is that the mark scheme? It looks right to me...
It's the markscheme.
5. (Original post by ArchedEdge)
Ah, it's late at night, what would be dy/du?
Late at night is no excuse for a potential Caian! If you set u=x^2, y=2^u, so dy/du is just what you found in part a
edit: too slow...
6. (Original post by sonofdot)
Late at night is no excuse for a potential Caian! If you set u=x^2, y=2^u, so dy/du is just what you found in part a
edit: too slow...
ha
7. (Original post by ArchedEdge)
Just need someone to explain this question from the 2007 Jan paper.

I don't get part b) of the question, and how you can use part a) to help you figure part b out.

Does it simply become e^((x^2)ln2)

You've gotta use the chain rule mate.

So bold.

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