anonymous
  • anonymous
I forgot logarithms :/ log_5(8r-7)=log_5(r^2+5)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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asnaseer
  • asnaseer
if:\[\log_bA=\log_bB\implies A=B\]
anonymous
  • anonymous
So all I need to do is set them equal to eachother? Sorry, I kinda forgot all this, and studying again.
asnaseer
  • asnaseer
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.

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anonymous
  • anonymous
Okay, but if i were to have something like: log_9(x+4)+log_9(x-4)=1
asnaseer
  • asnaseer
then you would use the rule:\[\log_bA+\log_bB=\log_b(A*B)\]
anonymous
  • anonymous
Ohhhh, okay, these rules are making its simple, are there any other important so I can study them? If you dont mind posting..
anonymous
  • anonymous
*Important rules
asnaseer
  • asnaseer
See this: http://www.purplemath.com/modules/logrules.htm
anonymous
  • anonymous
Perfect, thanks soo much!!
asnaseer
  • asnaseer
yw :)

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