Solve the given third- or fourth-order differential equation.D4y + 4 D3y - 9 D2y - 36 Dy = 0

A. y = c1e3x + c2e-3x + c3e4x 
B. y = c1 + c2e3x + c3e-3x + c4e4x 
C. y = c1 + c2e3x + c3e-3x+ c4e-4x
D. y = c1e3x + c2e-3x+ c3e4x

Answer: C

Mathematics

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