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chipotleaway
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Homework Statement
This an example from Boyce+DiPrima's text on ODEs. Original problem is to solve 2t2y''+3ty'-y=0, given that y1=1/t is a solution.
But I'm stuck at the part where I'm to solve
[itex]2tv''-v'=0[/itex],
v being the second unknown solution.
The Attempt at a Solution
In the text, they let w=v' which reduces the equation to
[itex]2tw'-w=0[/itex]
and solve by separation of variables.
I 'm trying to solve it by factoring differential operators (not sure what the method is called), so
[itex]v''-\frac{1}{2t}v'=0[/itex]
[itex]D(D-\frac{1}{2t})v=0[/itex]
Then I let [itex]w=(D-\frac{1}{2t})v[/itex],
[itex]\therefore Dw=0[/itex]
[itex]\therefore w=c_1[/itex]
[itex]\therefore v'-\frac{1}{2t}v=c_1[/itex]
But this isn't right - what am I doing wrong?