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DarkBlueChocobo

  • one year ago

Help with logarithms

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  1. DarkBlueChocobo
    • one year ago
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  2. DarkBlueChocobo
    • one year ago
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    so I believe the first one would be correct cause when put into 3^t=3^t

  3. DanJS
    • one year ago
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    http://www.purplemath.com/modules/logrules.htm those 3 rules

  4. DanJS
    • one year ago
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    and \[\log_{b}(b) = 1 \]

  5. DanJS
    • one year ago
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    1) you can move the t down in front, left with log base 3 of 3 = 1 so it is true

  6. DarkBlueChocobo
    • one year ago
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    what about number 2 is switching the 4.3 around make it the same?

  7. DanJS
    • one year ago
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    yes, you can move the power to the front, but ln is base e, so you cant simplify that more... 2) is true too

  8. DarkBlueChocobo
    • one year ago
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    For 3 Is it not true because they are being multiplied together not added seperately?

  9. DanJS
    • one year ago
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    log(x*y) = log(x) + log(y)

  10. DanJS
    • one year ago
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    do that , then move the power on y down

  11. DarkBlueChocobo
    • one year ago
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    what do you mean when you say move the y down?

  12. DanJS
    • one year ago
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    no, the power n, move that down in front like before

  13. DarkBlueChocobo
    • one year ago
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    |dw:1438918830800:dw|

  14. DanJS
    • one year ago
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    log(a^b) = b*log(a)

  15. DarkBlueChocobo
    • one year ago
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    oh move it to the front?

  16. DanJS
    • one year ago
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    yeah , just write down those 3 rules here to memorize http://www.purplemath.com/modules/logrules.htm

  17. DarkBlueChocobo
    • one year ago
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    Im going to say 3 is true also then saying it follows the rules

  18. DarkBlueChocobo
    • one year ago
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    would that be correct

  19. DanJS
    • one year ago
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    yes

  20. DarkBlueChocobo
    • one year ago
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    I will memorize these again. I'm studying for my College algebra CLEP test

  21. DanJS
    • one year ago
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    ah ok, yeah those types probs you just have to know a couple properties to manipulate the things

  22. DanJS
    • one year ago
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    unless you can use a calculator, then just put in sample values and test to see if it is =

  23. DarkBlueChocobo
    • one year ago
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    I can use a scientific calculator

  24. DanJS
    • one year ago
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    oh, even if you didnt know the properties , you could pick any value for the variables, and test if both sides are the same

  25. DanJS
    • one year ago
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    but that takes longer

  26. DarkBlueChocobo
    • one year ago
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    Alrights

  27. DarkBlueChocobo
    • one year ago
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    Thank you :)

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