Posted by **marcus** on Wednesday, November 21, 2012 at 3:14am.

My book tells me to solve each exponential equation. I am given a lot of problems such as

6^x+1 = 4^2x-1

where I use In in the problem to help get my answer. However, in the same section, the book starts giving me problems such as

3(2)^x-2 +1=100

and .05(1.15)^x =5 etc.

Where I apparently have to use log in the equations instead of using In like I did in all the other problems. Why is this? Like, how will I know weather to use In or log to find my answer? Is there a reason why you use log instead?

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