Solving ODE via Separation Method: Need Assistance

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SUMMARY

The discussion focuses on solving the ordinary differential equation (ODE) dy/dx = e^(x+y) using the separation method. The correct approach involves rewriting the equation as e^(-y) dy = e^x dx and integrating both sides. The general solution is derived as y = -ln(C - e^x), where C must be greater than e^x for the solution to be valid. The importance of including the constant of integration is emphasized in the solution process.

PREREQUISITES
  • Understanding of ordinary differential equations (ODEs)
  • Familiarity with the separation of variables method
  • Knowledge of integration techniques
  • Basic logarithmic properties and their applications
NEXT STEPS
  • Study the separation of variables technique in greater detail
  • Learn about integrating factors for solving ODEs
  • Explore the implications of the constant of integration in differential equations
  • Investigate other methods for solving first-order ODEs, such as exact equations
USEFUL FOR

Students and professionals in mathematics, particularly those studying differential equations, as well as educators seeking to clarify the separation method for solving ODEs.

Mugged
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Can anyone help me solve this ODE:
..in other words, find a general solution?

dy/dx = e^(x+y)

I use a separation method, but i can't take the natural log of -e^(-y).
So, help?
 
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Perhaps you can move the minus in front of e-y to the other side of your equation before you apply log.
 
Looks to me like you have forgotten the constant of integration. You should get something like y= -ln(C- e^x) which exists only for C> e^x or x< ln(C)
 
Mugged said:
Can anyone help me solve this ODE:
..in other words, find a general solution?

dy/dx = e^(x+y)

I use a separation method, but i can't take the natural log of -e^(-y).
So, help?

e^(x+y) = e^x * e*y
e^(-y) dy = e^x dx
integrate both sides
 

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