Question

Which of the following functions are solutions of the differential equation y′′−9y′+18y=0?

A. y(x)=e3x
B. y(x)=6x
C. y(x)=3x
D. y(x)=0
E. y(x)=e−x
F. y(x)=e6x
G. y(x)=ex

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