Hello! This is my first post in this forum, I spend mamy time in this exercise, but I can't iron out. Maybe someone help me? It's very important for me, because in september I need pass the exam.

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- Aug 27th 2012, 08:17 AManka0501Exam DE
Hello! This is my first post in this forum, I spend mamy time in this exercise, but I can't iron out. Maybe someone help me? It's very important for me, because in september I need pass the exam.

Find:

- Aug 27th 2012, 09:39 AMHallsofIvyRe: Exam DE
I presume that if you are taking an exam in September, then you are taking the course now. Certainly, you must have learned

**something**about problems like this. How would you**solve**a system of equations like this? - Aug 28th 2012, 01:00 AManka0501Re: Exam DE
I think this is not tall order, I can solve this equation : dx/dt= ax-t-a; x(0)=1, Find dx/da(t) for a=0, but this I can't find the correct answer.

- Sep 8th 2012, 06:52 AMHallsofIvyRe: Exam DE
Then you should not be attempting an equation like this. There are several different ways, involving reducing to a single

**second**order equation or finding eigenvalues of a related matrix, but you seem to be saying you do not know those. Learn higher order linear differential equations before attempting systems of equations.