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Differential equations Problem Set 6

Please answer all of the fol lowing questions . The problems marked with an asterisk will be
graded while the remained problems will be checked for completeness. Staple your work to
this sheet of paper and indicate your answers clearly. Don’t forget your name and please
circle your section number .

1. Section 10.1 (pp. 575–576) 5, 6, 7, 9, 15*, 16*.

2. Section 10.2 (pp. 585–587) 14*, 15, 17.

3. A second- order Cauchy -Euler equation has the form

where α are β are constants (see Section 5.5). Homogeneous solutions of this equation may
be found in a similar manner as those for constant coefficient equations. The purpose of
this exercise is to illustrate this point.

(a) Show that y = xr is a solution of the Cauchy-Euler equation if r satisfies the characteristic
polynomial

Let us now as sume that r 1 and r2 are roots of the characteristic polynomial obtained using
the quadratic formula . There are three cases to consider.

1. If r1 and r2 are real and unequal , then the general solution has the form

2. If r1 and r2 are complex conjugates , equal to λ±iμ say, then the general solution has
the form

3. If r1 = r2 = r, then the general solution has the form

(b) Find general solutions for the following equations.

Parts (a) and (b) are “starred” problems.

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