How Do You Solve the Differential Equation dy/dt + (1/t)y = t*exp(-2t)?

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SUMMARY

The differential equation dy/dt + (1/t)y = t*exp(-2t) can be solved using an integrating factor. The integrating factor, u(t), is derived from the left-hand side of the equation, leading to a separable equation. The correct interpretation of the term (1/t)y is crucial for clarity in calculations. This approach simplifies the process of finding the general solution.

PREREQUISITES
  • Understanding of first-order linear differential equations
  • Familiarity with integrating factors in differential equations
  • Knowledge of separable equations
  • Basic calculus, specifically differentiation and manipulation of functions
NEXT STEPS
  • Study the method of integrating factors in detail
  • Learn how to solve separable differential equations
  • Explore examples of first-order linear differential equations
  • Review the properties of exponential functions in differential equations
USEFUL FOR

Mathematics students, educators, and anyone interested in solving differential equations, particularly those focusing on first-order linear equations and integrating factors.

Eggmans
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Compute the general solution of the differential equation?

dy/dt+1/t y = t*exp(-2t)

y is outside 1/t


can't seem to get it
 
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Find the integrating factor for the left hand side.

d/dt (some function * y) = ...
 
d(u(t)y)/dt= u(t)y'+ u'(t)y and you want that equal to u(t)y'+ (u(t)/t)y. That gives a simple separable equation for the integrating factor, u.

By the way, simpler than saying "y is outside 1/t" is to use parentheses: (1/t)y
 

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