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52217_integrating factor method

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					Integrating Factor Method

   1. Write the linear non-separable differential equation in the form:
      dy/dx + p(x)*y = q(x)

   2. Find the integrating factor, I:
      I = eintegral(p(x) dx)

   3. Multiply entire equation by integrating factor. Distribute to each term.

   4. Undo product rule. In other words you have: f(x)g’(x) + g(x)f ’(x) and you want to get f(x)
      and g(x) back. Note these must be some expressions already in the equation.

   5. Integrate both sides. Note you will have [f(x)g(x)] ’ on the left from undoing product rule
      so integrating that yields just f(x)g(x)

   6. Solve for y, if possible. Solve for + C, if given an initial condition.

				
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posted:4/13/2011
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