Differential equations Problem Set 6
Please answer all of the following 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
Let us now assume that r1 and r2 are roots of the characteristic polynomial
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
3. If r1 = r2 = r, then the general solution has the form
Parts (a) and (b) are “starred” problems.