I have a question on complex roots. I have the eqn 8y'' +18y' +18y = 0, with the initial conditions of y(0)=3 and y'(0) = 4. I am trying to put this in the form y = Ae^rx +Be^rx, with my r = -9/8 +/- sqrt(126)....can anyone give pointers on getting the correct A and B? My answers are still wrong :(

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