x^{''}+6x^'+25x=0

解答

x^{^{''}} + 6 x^{^{'}} + 25 x = 0

x = e^{- 3 t} (c_{1} cos (4 t) + c_{2} sin (4 t))

求解步骤

x^{''} (t) + 6 x^{'} (t) + 25 x = 0

求解线性方程:

x = e^{- 3 t} (c_{1} cos (4 t) + c_{2} sin (4 t))

x = e^{- 3 t} (c_{1} cos (4 t) + c_{2} sin (4 t))

y^{^{'''}} - y^{^{''}} - 4 y = 0

y^{^{''}} - 12 y^{^{'}} - 28 y = 0

y^{^{''''}} - 9 y^{^{'''}} + 30 y^{^{''}} - 44 y^{^{'}} + 24 y = 0

y^{^{'''}} - 2 y^{^{''}} + y^{^{'}} - 2 y = 0

6 y^{^{''}} + y^{^{'}} - y = 0, y (0) = e^{\frac{x}{3}}