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Find a general solution to the given differential equationy''+8y'-9y=0.

Short Answer

Expert verified

The general solution to the given differential equation isy=c1e-9t+c2et.

Step by step solution

01

Write the auxiliary equation of the given differential equation. 

The given differential equation isy''+8y'-9y=0.

The auxiliary equation for the above equationm2+8m-9=0.

02

Find the roots of the auxiliary equation

Solve the auxiliary equation,

m2+8m-9=0m2+9m-m-9=0mm+9-1m+9=0m+9m-1=0

The roots of the auxiliary equation arem1=-9 & m2=1.

The general solution of the given equation isy=c1e-9t+c2et.

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