1.

Find the differential equation corresponding to the equation `y=Ae^(2x)+Be^(-x)`.

Answer» `y=Ae^(2x)+Be^(-x)`……….`(1)`
`implies (dy)/(dx)=2Ae^(2x)+Be^(-x)`………`(2)`
`implies (d^(2)y)/(dx^(2))=4Ae^(2x)+Be^(-x)`………….`(3)`
Adding eqs. `(1)` and `(2)`
`(dy)/(dx)+y=3Ae^(2x)` ……………`(4)`
Adding eqs. `(2)` and `(3)`
`(d^(2)y)/(dx^(2))+(dy)/(dx)=6A*e^(2x)`
`implies (d^(2)y)/(dx^(2))+(dy)/(dx)=2((dy)/(dx)+y)` [From eq. `(4)`]
`implies (d^(2)y)/(dx^(2))-(dy)/(dx)-2y=0`.


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