anonymous
  • anonymous
How do you solve when you have logs on one side but not the other? (2 problems inside)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
2 Attachments
anonymous
  • anonymous
use the product rule log A + log B = log (AB)
anonymous
  • anonymous
I tried that... for Log x + log (x+15) = 2 I have (Log x)(log (x+15)) =2 i dont know what to do after The answer is 5

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More answers

saifoo.khan
  • saifoo.khan
\[\lg x(x+15) = 2\]
RadEn
  • RadEn
convert 2 to log 100
AravindG
  • AravindG
log x+log (x+15)=log(x(x+15))!!
RadEn
  • RadEn
it just a hint, so that both sides have log's :)
anonymous
  • anonymous
But how do you go from log(x(x+15)=2.. to x=5? I can't get that part
RadEn
  • RadEn
log(x(x+15))=2 log(x(x+15)=log100 cancel out the log, giving us : x(x+15)=100 or x^2+15x-100=0 solve for x by factorization or by complete square or by quadratic formula
RadEn
  • RadEn
got it ?
anonymous
  • anonymous
Yes! Just solved it.. thank you!
RadEn
  • RadEn
yw
anonymous
  • anonymous
I didn't think of doing log 100 to cancel the logs on both sides

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