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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 = x^{r} is a solution of the CauchyEuler equation if r
satisfies the characteristic
polynomial
Let us now as sume that r _{1} and r_{2 }are roots of the characteristic polynomial
obtained using
the quadratic formula . There are three cases to consider.
1. If r_{1} and r_{2} are real and unequal , then the general solution has the form
2. If r_{1} and r_{2} are complex
conjugates , equal to λ±iμ say, then the general solution has
the form
3. If r_{1} = r_{2} = 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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