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Find a general solution for the differential equation with x as the independent variable:

y'''+5y''+3y'−9y=0

Short Answer

Expert verified

The general solution for the differential equation with x as the independent variable is y(x)=c1ex+c2e−3x+c3xe−3x

Step by step solution

01

Auxiliary equation:

Consider the equation .y'''+5y''+3y'−9y=0

The associated auxiliary equation is r3+5r2−3r−9=(r−1)(r+3)2=0which has r=−3as a double solution andr=1 as a simple solution.

02

General solution:

The general solution to the given equation is given by

y(x)=c1ex+c2e−3x+c3xe−3x

Hence the final solution is y(x)=c1ex+c2e−3x+c3xe−3x

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Most popular questions from this chapter

Use the annihilator method to show that ifa0≠0in equation (4) and fxhas the form (17) f(x)=bmxm+bm-1xm-1+⋯+b1x+b0, thenyp(x)=Bmrxm+Bm-1xm-1+⋯+B1x+B0is the form of a particular solution to equation (4).

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On a smooth horizontal surface, a mass of m1 kg isattached to a fixed wall by a spring with spring constantk1 N/m. Another mass of m2 kg is attached to thefirst object by a spring with spring constant k2 N/m. Theobjects are aligned horizontally so that the springs aretheir natural lengths. As we showed in Section 5.6, thiscoupled mass–spring system is governed by the systemof differential equations

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Let’s assume that m1 = m2 = 1, k1 = 3, and k2 = 2.If both objects are displaced 1 m to the right of theirequilibrium positions (compare Figure 5.26, page 283)and then released, determine the equations of motion forthe objects as follows:

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