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In exercises 7-12, given the list of roots and multiplicities of the characteristic equation, form a...

In exercises 7-12, given the list of roots and multiplicities of the characteristic equation, form a general solution. What is the order of the corresponding differential equation?

r = -2, k = 3; r = 2, k = 1

Answer is apparently 4th order, y=(c1+c2t+c3t^(2))e^(-2t)+c4e^(2t)

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