C4 integration by parts

pinesandapples2001

I need help with question d. It's a stretch question. I don't know what I'm supposed to do with log x, and how to relate it to this chapter. I've never learnt how to differentiate log, only ln, and I don't think I'm supposed to know a formula to differentiate log, so I'm a bit confused as to what to do. All help appreciated, x.

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Reply 1

Muttley79

20

Original post by Danielnovels25

I need help with question d. It's a stretch question. I don't know what I'm supposed to do with log x, and how to relate it to this chapter. I've never learnt how to differentiate log, only ln, and I don't think I'm supposed to know a formula to differentiate log, so I'm a bit confused as to what to do. All help appreciated, x.

Can you think of a way of changing log into ln?

Reply 2

ghostwalker

17

Original post by Danielnovels25

I need help with question d. It's a stretch question. I don't know what I'm supposed to do with log x, and how to relate it to this chapter. I've never learnt how to differentiate log, only ln, and I don't think I'm supposed to know a formula to differentiate log, so I'm a bit confused as to what to do. All help appreciated, x.

When you first learnt logs, you would have learnt several rules for manipulating them. One of which is how to change base. Can you think of how you might represent log base 10 in terms of log base e, ie. ln?