Kainui
  • Kainui
e^x=-x solve for x
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
apply ln (natural log) of both sides
waleed_imtiaz
  • waleed_imtiaz
what I have to do here? take left hand side... =e^x ...take log ... xlne =x....=R.H.S
Kainui
  • Kainui
\[x=\ln(-x)\]

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Kainui
  • Kainui
All this tells me is that x must be negative, otherwise the log function will be broken.
Kainui
  • Kainui
I know there's an answer because the graphs of y=e^x and y=-x intersect at some point.
waleed_imtiaz
  • waleed_imtiaz
x should be positive I think so thats why we take mood like ln|x|
anonymous
  • anonymous
good luck algebra will not do it
anonymous
  • anonymous
you will use technology or numerical methods
anonymous
  • anonymous
http://www.wolframalpha.com/input/?i=e^x%3D-x
Kainui
  • Kainui
Damn, there's no alternative trick then? Hmm.

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