# Thread:

1. ## express as a single logarithm: PLEASE HELP with a few questions?

hello everyone, i am new here and plan to use this forum often, you guys seem very friendly. I am in college algebra right now and im having a huge problem with a few questions on my review packet for the exam coming up, the test is in a few days and these questions are going to be similar to the exam. i have been looking at my math book for the last 3-4 hours and i just cant find any similar questions, im stuck. very frustrated & stressed from this as well.

i scanned the math problem packet my teacher gave me to my pc, i mostly need help on "Express as a single logarithm" problems, they are the last 4 questions. but if you got extra time i would really appreciate it if you can help me on the top questions as well, but i know that might be asking to much so if anything just an answer to atleast one question from problems 11,12,13, or 14 would be great. thank you so much

here is the link of my problem packet, its a .jpg

if possible show your work to how you solved the problem, because i really would like to know how to do these. but if you cant i understand, it would be hard to type it out.

Thanks again everyone, this really is going to help me understand it a lot better.

2. Originally Posted by murkr
hello everyone, i am new here and plan to use this forum often, you guys seem very friendly. I am in college algebra right now and im having a huge problem with a few questions on my review packet for the exam coming up, the test is in a few days and these questions are going to be similar to the exam. i have been looking at my math book for the last 3-4 hours and i just cant find any similar questions, im stuck. very frustrated & stressed from this as well.

i scanned the math problem packet my teacher gave me to my pc, i mostly need help on "Express as a single logarithm" problems, they are the last 4 questions. but if you got extra time i would really appreciate it if you can help me on the top questions as well, but i know that might be asking to much so if anything just an answer to atleast one question from problems 11,12,13, or 14 would be great. thank you so much

here is the link of my problem packet, its a .jpg

http://img197.imageshack.us/img197/5791/page1math.jpg

if possible show your work to how you solved the problem, because i really would like to know how to do these. but if you cant i understand, it would be hard to type it out.

Thanks again everyone, this really is going to help me understand it a lot better.
Dear murkr,

To answer these questions you only need to know some laws of logarithms. Basically,

$log_{a}A+log_{a}B=log_{a}(AB)$

$log_{a}A-log_{a}B=log_{a}\left(\frac{A}{B}\right)$

$c~log_{a}A=log_{a}A^{c}$

For a more detailed explanation please refer List of logarithmic identities - Wikipedia, the free encyclopedia

3. Originally Posted by Sudharaka
Dear murkr,

To answer these questions you only need to know some laws of logarithms. Basically,

$log_{a}A+log_{a}B=log_{a}(AB)$

$log_{a}A-log_{a}B=log_{a}\left(\frac{A}{B}\right)$

$c~log_{a}A=log_{a}A^{c}$

For a more detailed explanation please refer List of logarithmic identities - Wikipedia, the free encyclopedia

i have a problem i got two different answers for question 8

is this right

$%288%29%5C;%5C;%5Clog_%7B17%7D%5C,%5Cleft%28%5Cfrac%7B%5Csqrt[4]%7B5%7D%7D%7Bn%5E2m%5E2%7D%5Cright%29$
$%5Clog_%7B17%7D%5Cleft%28%5Cfrac%7B%5Csqrt[4]%7B5%7D%7D%7Bn%5E2m%5E2%7D%5Cright%29%20%5C;=%5C;%20%5Clog_%7B17%7D%5Cleft%28%5Csqrt[4]%7B5%7D%5Cright%29%5C,-%5C,%5Clog_%7B17%7D%5Cleft%28n%5E2m%5E2%5Cright%29$

. . . . . . . . . .$=%5C;%5Clog_%7B17%7D%5Cleft%285%5E%7B%5Cfrac%7B1%7D%7B4%7D%7D%5Cright%29%20%5C,-%5C,%20%5Cbigg[%5Clog_%7B17%7D%28n%5E2%29%20%5C,+%5C,%5Clog_%7B17%7D%28m%5E2%29%5Cbigg]$

. . . . . . . . . .$=%5C;%5Cfrac%7B1%7D%7B4%7D%5C,%5Clog_%7B17%7D%285%29%20%5C,-%5C,2%5C,%5Clog_%7B17%7D%28n%29%20%5C,-%5C,2%5C,%5Clog_%7B17%7D%28m%29%5C;%5C;%5C;%20%28A%29$

i got C for #8
the problem above says A for #8

4. Originally Posted by murkr
i have a problem i got two different answers for question 8

is this right
$%288%29%5C;%5C;%5Clog_%7B17%7D%5C,%5Cleft%28%5Cfrac%7B%5Csqrt[4]%7B5%7D%7D%7Bn%5E2m%5E2%7D%5Cright%29$
$%5Clog_%7B17%7D%5Cleft%28%5Cfrac%7B%5Csqrt[4]%7B5%7D%7D%7Bn%5E2m%5E2%7D%5Cright%29%20%5C;=%5C;%20%5Clog_%7B17%7D%5Cleft%28%5Csqrt[4]%7B5%7D%5Cright%29%5C,-%5C,%5Clog_%7B17%7D%5Cleft%28n%5E2m%5E2%5Cright%29$

. . . . . . . . . .$=%5C;%5Clog_%7B17%7D%5Cleft%285%5E%7B%5Cfrac%7B1%7D%7B4%7D%7D%5Cright%29%20%5C,-%5C,%20%5Cbigg[%5Clog_%7B17%7D%28n%5E2%29%20%5C,+%5C,%5Clog_%7B17%7D%28m%5E2%29%5Cbigg]$

. . . . . . . . . .$=%5C;%5Cfrac%7B1%7D%7B4%7D%5C,%5Clog_%7B17%7D%285%29%20%5C,-%5C,2%5C,%5Clog_%7B17%7D%28n%29%20%5C,-%5C,2%5C,%5Clog_%7B17%7D%28m%29%5C;%5C;%5C;%20%28A%29$

i got C for #8
the problem above says A for #8
Hi murkr,

"A" is the correct answer for #8.

5. Originally Posted by masters
Hi murkr,

"A" is the correct answer for #8.
thank you for varying that for me.

i just got one last question, i understand all the problems expect problems #10 and #14

if you can do just one or both of these i would really appreciate it, im having such a hard time with these my books have no examples of these. without you guys i wouldnt know what to do thank you.

6. ## express as a single log

Originally Posted by murkr
hello everyone, i am new here and plan to use this forum often, you guys seem very friendly. I am in college algebra right now and im having a huge problem with a few questions on my review packet for the exam coming up, the test is in a few days and these questions are going to be similar to the exam. i have been looking at my math book for the last 3-4 hours and i just cant find any similar questions, im stuck. very frustrated & stressed from this as well.

i scanned the math problem packet my teacher gave me to my pc, i mostly need help on "Express as a single logarithm" problems, they are the last 4 questions. but if you got extra time i would really appreciate it if you can help me on the top questions as well, but i know that might be asking to much so if anything just an answer to atleast one question from problems 11,12,13, or 14 would be great. thank you so much

here is the link of my problem packet, its a .jpg

http://img197.imageshack.us/img197/5791/page1math.jpg

if possible show your work to how you solved the problem, because i really would like to know how to do these. but if you cant i understand, it would be hard to type it out.

Thanks again everyone, this really is going to help me understand it a lot better.
You've gotten helpful info already. Here is another demo

no 12

3logB6(x) + 5 logB6(x-6)
LogB6 (x^3) +logB6(x-6)^5
logB6( X^3) (x-6)^5 Answer is A

bjh

7. Originally Posted by murkr
thank you for varying that for me.

i just got one last question, i understand all the problems expect problems #10 and #14

if you can do just one or both of these i would really appreciate it, im having such a hard time with these my books have no examples of these. without you guys i wouldnt know what to do thank you.
Dear murkr,

They are done using the same identities I have given you. However you must do some factorization to get the answer of question 14.

8. ## express as a single log

Originally Posted by murkr
hello everyone, i am new here and plan to use this forum often, you guys seem very friendly. I am in college algebra right now and im having a huge problem with a few questions on my review packet for the exam coming up, the test is in a few days and these questions are going to be similar to the exam. i have been looking at my math book for the last 3-4 hours and i just cant find any similar questions, im stuck. very frustrated & stressed from this as well.

i scanned the math problem packet my teacher gave me to my pc, i mostly need help on "Express as a single logarithm" problems, they are the last 4 questions. but if you got extra time i would really appreciate it if you can help me on the top questions as well, but i know that might be asking to much so if anything just an answer to atleast one question from problems 11,12,13, or 14 would be great. thank you so much

here is the link of my problem packet, its a .jpg

if possible show your work to how you solved the problem, because i really would like to know how to do these. but if you cant i understand, it would be hard to type it out.

Thanks again everyone, this really is going to help me understand it a lot better.

Your latest question help for 10 and 14.

you were told by others that you needed to factor the quadradics.When you do this and follow the log rules you get answer B.Each quadradic is easily factored.

bjh
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