Solve the differential equation.y'' + 8y' - 5y = 0
A. y =e
x (C1 e-4x + C2 e4x )
B. y = e4x(C1e
x + C2e-
x )
C. y = e-4x(C1e
x + C2e-
x )
D. y = e-4x(C1 cos 
x + C2 sin 
x )
Answer: C
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A. 
B. ?
C. ?
D. ?
E. ?