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- Jan 25th 2010, 03:02 PM #1

- Joined
- Nov 2009
- Posts
- 39

## Please help with an ln problem

Can anyone help with this problem?

ln(r^3s^7([7th root](r^7s^10)))

is equal to A ln r +B ln s

where A=______ and B=________

This is what I have so far:

3 ln r + 7 ln s + 7th root (r^7s^10)

I thought it should be

3 ln r + 7 ln s + 49/2 ln r + 70/2 ln s=

55/2 ln r + 84/2 ln s

but that is wrong. How do you do the 7th root?

- Jan 25th 2010, 04:01 PM #2