y=A e^{-x}+B e^{n x}, \text { show that } \frac{d^{2} y}{d x^{2}}-(m+n – InterviewSolution

1.	y=A e^{-x}+B e^{n x}, \text { show that } \frac{d^{2} y}{d x^{2}}-(m+n) \frac{d y}{d x}+m n y=0
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