# Few questions about LOGS

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• May 2nd 2014, 06:52 AM
ben123123
Few questions about LOGS
Hey forum, I'm a bit confused on a few questions, if the work is too hard to display just the answer would be alright I could work backwards to see what i did wrong!

Thanks in advance!

1) comparing Log(base9) X -> 3Log(Base9)[3(x+6)]-6 explain what has happened to the graph.

2) Solve 10^(2x-5)=7^(x+4)

3) Solve Log(3x+15)=Log(x+3)+1

4) solve 9^(x-1)=1/3^(4x-1) <-- I got 1/3 for that one not sure if it's correct

5) Solve 3^x = 9^(x^2-1/2)

6) Solve 2Log(Base4)(x+4)-Log(base4)(x+12)=1 <---- I know that one involved doing quadratic forumula or factoring but not sure on how to do.

7) explain steps to solving Log(base2)(Rootsymbol)x^2-8x=log(base2)3

-ben
• May 2nd 2014, 07:58 AM
HallsofIvy
Re: Few questions about LOGS
It's hard to know what kind of help you need without knowing what you do understand about logarithms.

Clearly you do know some of the things I started to write because, for problem 4, you say "I got 1/3 for that one not sure if it's correct", which is correct. But you don't show how you got it. Show what you have tried on these problems.
• May 2nd 2014, 08:16 AM
ben123123
Re: Few questions about LOGS
Awesome thanks for the reply, I do understand about 2/3 of logs and i've solved the answers given, I just need to double check that my stuff is correct so I don't end using wrong steps on my upcoming test.

Like for 1) I know the graph moves down 6 on the Y and when inside the brackets it's the opposite but im not sure if the graph moves -6 on X or it compresses or expands?
• May 2nd 2014, 08:36 AM
ben123123
Re: Few questions about LOGS
I have a quiz later on today so i need to check my answers
• May 2nd 2014, 11:37 AM
HallsofIvy
Re: Few questions about LOGS
Yet, you still refuse to show your own work?