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  • 27-10-2016
  • Mathematics
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What is the answer to 400/(1+e^-x)=350

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Аноним Аноним
  • 27-10-2016
400/(1+e^-x)=350
400=350(1+e^-x)
400=350+350e^-x
350e^-x=400-350
350e^-x=50
e^-x=50/350
e^-x=1/7
ln e^-x=ln (1/7)
-x ^(ln e)=ln1-ln7
-x(1)=0-ln7
x=ln7

Answer: x= ln 7  ≈1.94591...
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