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The general solution of the differential equation

                                                  $\frac{d^2y}{dx^2}+2\frac{dy}{dx}-5y=0$

in terms of arbitrary constants $K_1$ and $K_2$ is

  1.  $K_1e^{(-1+\sqrt{6})x}+K_2e^{(-1-\sqrt{6})x}$                    
  2.  $K_1e^{(-1+\sqrt{8})x}+K_2e^{(-1-\sqrt{8})x}$
  3.  $K_1e^{(-2+\sqrt{6})x}+K_2e^{(-2-\sqrt{6})x}$         
  4.  $K_1e^{(-2+\sqrt{8})x}+K_2e^{(-2-\sqrt{8})x}$
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