Sun K.

# Solve the differential equation?

Solve the differential equation y^(4)-5y"-36y=0.

r^4-5r^2-36

(r^2-9)(r^2+4)

r=3, -3, 2i, -2i

y=c1*e^3x+c2*e^-3x+c3(cos(2x))+c4(sin(2x))

And can someone give me some websites that has lots of practice problems like this for differential equations?

Sun K.

Thank you so much.

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06/19/13