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zepelin [54]
3 years ago
5

Solve to three significant digits 123= 500e ^ -0.12x

Mathematics
1 answer:
Anon25 [30]3 years ago
8 0
500{ e }^{ -0.12x }=123\\ \\ { e }^{ -\frac { 12 }{ 100 } x }=\frac { 123 }{ 500 } \\ \\ { e }^{ -\frac { 3 }{ 25 } x }=\frac { 123 }{ 500 }

\\ \\ { \left( { e }^{ x } \right)  }^{ -\frac { 3 }{ 25 }  }=\frac { 123 }{ 500 } \\ \\ { e }^{ x }={ \left( \frac { 123 }{ 500 }  \right)  }^{ \frac { 1 }{ -\frac { 3 }{ 25 }  }  }

\\ \\ { e }^{ x }={ \left( \frac { 123 }{ 500 }  \right)  }^{ -\frac { 25 }{ 3 }  }\\ \\ \ln { \left( { \left( \frac { 123 }{ 500 }  \right)  }^{ -\frac { 25 }{ 3 }  } \right)  } =x

\\ \\ x=-\frac { 25 }{ 3 } \ln { \left( \frac { 123 }{ 500 }  \right)  }

\therefore \quad x\approx 11.7
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