Homework Help: Solve for x

1. Dec 7, 2004

chjopl

2^x=7*5^x
I know you have to take ln of both sides but i am having trouble doing that for the right side.

2. Dec 7, 2004

shmoe

Remember the property of logarithms, ln(ab)=ln(a)+ln(b). That should help you deal with the right hand side.

Last edited: Dec 7, 2004
3. Dec 7, 2004

dextercioby

I could give u the only hint possible,but that would be useless.So i'll better show u my version.Logarithmate both sides of the equation to find:
$$x\ln 2=\ln 7+x\ln 5 =>x=\frac{\ln 7}{\ln 2-\ln 5}$$.

Okay...??Clear???

PS:Shmoe,u were quicker than me...Again. :tongue2:

4. Dec 7, 2004

chjopl

Yeah thanks alot i was messing up and having ln7*xln5