Two ordinary differential equations in terms of unknown functions u(x) and v(x) are given below. u′(x)−5u(x) = 3v(x)+3(ex+e−x) v′(x)+4v(x) = −6u(x) a.) Show that the given first order ordinary differential equations above can be expressed as a second order ordinary differential equation as shown below: (HINT: You can start your solution by differentiating the first equation with respect to x.) u′′(x)−u′(x)−2u(x) = 15ex+9e−x b.)  Determine the general solution of the ODE given above. Use ONLY the method of variation of parameters.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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Two ordinary differential equations in terms of unknown functions u(x) and v(x) are given below.
u′(x)−5u(x) = 3v(x)+3(ex+e−x)
v′(x)+4v(x) = −6u(x)

a.) Show that the given first order ordinary differential equations above can be expressed as a second order ordinary differential equation as shown below: (HINT: You can start your solution by differentiating the first equation with respect to x.)
u′′(x)−u′(x)−2u(x) = 15ex+9e−x
b.)  Determine the general solution of the ODE given above. Use ONLY the method of variation of parameters.

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