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Math Help - express as a single logarithm: PLEASE HELP with a few questions?

  1. #1
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    Red face 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.
    Last edited by murkr; April 20th 2010 at 12:31 AM.
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  2. #2
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    Quote Originally Posted by murkr View Post
    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

    Hope this will help you.
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    Quote Originally Posted by Sudharaka View Post
    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

    Hope this will help you.
    i have a problem i got two different answers for question 8

    is this right



    . . . . . . . . . .

    . . . . . . . . . .

    i got C for #8
    the problem above says A for #8
    Last edited by murkr; April 19th 2010 at 11:11 AM.
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  4. #4
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    Quote Originally Posted by murkr View Post
    i have a problem i got two different answers for question 8

    is this right


    . . . . . . . . . .

    . . . . . . . . . .

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

    "A" is the correct answer for #8.
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  5. #5
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    Quote Originally Posted by masters View Post
    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.
    Last edited by murkr; April 19th 2010 at 02:41 PM.
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  6. #6
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    express as a single log

    Quote Originally Posted by murkr View Post
    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
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    Quote Originally Posted by murkr View Post
    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.
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  8. #8
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    express as a single log

    Quote Originally Posted by murkr View Post
    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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