Solving System of Two Differential Equations

tsslaporte
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Homework Statement

Find General Solution of the Following System

(2D+5)x - (2D+3)y = t

(D-2)x + (D+2)y = 0


https://dl.dropboxusercontent.com/u/32294083/Emath/New%20Doc%203_1.jpg


Using the Quadratic Formula I get nothing so I am not sure what the complementary solution is.

After this what do I do to find the General Solution?
 
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tsslaporte said:
Homework Statement

Find General Solution of the Following System

(2D+5)x - (2D+3)y = t

(D-2)x + (D+2)y = 0


https://dl.dropboxusercontent.com/u/32294083/Emath/New%20Doc%203_1.jpg


Using the Quadratic Formula I get nothing so I am not sure what the complementary solution is.

After this what do I do to find the General Solution?

Start over: your "characteristic equation" is wrong, so far as I can make out. You really should type this stuff out; your writing is borderline unreadable.
 
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There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
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