(adsbygoogle = window.adsbygoogle || []).push({}); Is this DE nonlinear????

1. The problem statement, all variables and given/known data

Determine the order and if this equation is Linear or Nonlinear.

3(d4x/dt4) + 4(dx/dt) + 9x = 3cos(3t)

The d4x is a forth order derivative. Sorry for the messiness.

Ok, this is a 4th order DE. I think it is nonlinear because of the two products (multiplying 4 time the derivative and 4 times the other derivative).

Also, the 3cos(3t) has no bearing on this because t is independent right? If the t was a y, that would cause nonlinearness.

Am I right on all this?

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# Homework Help: Is this DE nonlinear?

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