Question

What is the solution of the differential equation y'' - y' - 12y = 0?
A) y = c1e^(4x) + c2e^(-3x)
B) y = c1e^(-4x) + c2e^(3x)
C) y = c1e^(3x) + c2e^(-4x)
D) y = c1e^(-3x) + c2e^(4x)