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GOODMAN

  • 3 years ago

I forgot logarithms :/ log_5(8r-7)=log_5(r^2+5)

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  1. asnaseer
    • 3 years ago
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    if:\[\log_bA=\log_bB\implies A=B\]

  2. GOODMAN
    • 3 years ago
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    So all I need to do is set them equal to eachother? Sorry, I kinda forgot all this, and studying again.

  3. asnaseer
    • 3 years ago
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    yes, so assuming your question is:\[\log_5(8r-7)=\log_5(r^2+5)\]then you would have:\[8r-7=r^2+5\]solve this for r.

  4. GOODMAN
    • 3 years ago
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    Okay, but if i were to have something like: log_9(x+4)+log_9(x-4)=1

  5. asnaseer
    • 3 years ago
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    then you would use the rule:\[\log_bA+\log_bB=\log_b(A*B)\]

  6. GOODMAN
    • 3 years ago
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    Ohhhh, okay, these rules are making its simple, are there any other important so I can study them? If you dont mind posting..

  7. GOODMAN
    • 3 years ago
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    *Important rules

  8. asnaseer
    • 3 years ago
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    See this: http://www.purplemath.com/modules/logrules.htm

  9. GOODMAN
    • 3 years ago
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    Perfect, thanks soo much!!

  10. asnaseer
    • 3 years ago
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    yw :)

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