anonymous
  • anonymous
Hellllpppp :'( Solve 3^(x – 4)= 7^(x + 9)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
hey angellaaa :). You seem nice, can you help me??
angela210793
  • angela210793
I wish I could...i did smth..but i stuck later :(( this is wht wolframalpha says though....http://www.wolframalpha.com/input/?i=3^%28x+%E2%80%93+4%29%3D+7^%28x+%2B+9%29
.Sam.
  • .Sam.
3^(x-4)=7^(x+9) ln(3^(x-4))=ln(7^(x+9)) xln(3)-4ln(3)=ln(7^(x+9)) xln(3)-4ln(3)-xln(7)=9ln(7) x(ln(3)-ln(7))=4ln(3)+9ln(7) x=(4ln(3)+9ln(7)) / (ln(3)-ln(7))

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angela210793
  • angela210793
Thanks Sam :D
.Sam.
  • .Sam.
no problem :)
anonymous
  • anonymous
what the answer though ? heheh didnt get it lol
anonymous
  • anonymous
did you get it agela?
anonymous
  • anonymous
\[\ln(3^{x-4)}=\ln(7^{x+9)}\]
anonymous
  • anonymous
xln3-4ln3=xln7+9ln7
anonymous
  • anonymous
x(ln(3)-ln(7))=4ln(3)+9ln(7)
anonymous
  • anonymous
x(1.1-1.9)=4.39+17.51 x(-0.8)=21.9 x=21.9/-0.8 x=-27.4
anonymous
  • anonymous
if my opptions are: x ≈ –0.04 x ≈ –2.59 x ≈ –25.86 x ≈ –0.39 which one is it??? :S
anonymous
  • anonymous
c!! since its close to it..
anonymous
  • anonymous
waw thnks mattthh
anonymous
  • anonymous
no problem, :]

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