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**Mentor note: Thread moved to Diff. Equations subforum**

Hello, few days ago I had a calculus test in which I had to find the general solution for the next differential equation: (D^8 - 2D^4 + D)y = 0.

"D" stands for the differential "Dy/Dx". However I could only find 2 of the roots on the ecuation, x

_{1}= 0 and x

_{2}= 1.

By the time I took the test I only knew 3 methods, the P/Q Descartes Method, factorization & the legendary and well known quadratic formula.

Then when I got home I entered the differential equation on matlab & got the next roots

So can anyone tell me how to get the remaining roots or what method I have to use?

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