Solving Euler equationplease check work thanks

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SUMMARY

The discussion focuses on solving the Euler equation represented by the differential equation \(x^2y'' - 5xy' + 9y = 0\). The user identifies the parameters \(Q/P = A = -5\) and \(R/P = B = 9\) and attempts to apply the substitution \(y = x^r\) to find the general solution. The confusion arises during the substitution process, particularly in handling the characteristic equation and separating variables. The conversation emphasizes the importance of correctly substituting derivatives into the original differential equation.

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darryw
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Homework Statement


determine the gen sol of the DE

[tex]x^2y'' - 5xy' + 9y = 0[/tex]


Q/P = A = -5 and R/P = B = 9

then use y = x^r in original DE...
y' = rx^(r-1)
y'' = (r-1)rx^(r-2)

insert into DE
[tex] x^2 (r-1)rx^{r-2} - 5x(rx^{r-1})+ 9x^r = 0[/tex]

i am confused as to how to proceed.. it looks like a characteristic, but do i separate the x's or what?? please help thanks

 
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Hi darryw! :smile:
darryw said:
[tex] x^2 (r-1)rx^{r-2} - 5x(rx^{r-1})+ 9x^r = 0[/tex]

erm :redface: … they're all xr :biggrin:

get some sleep! :zzz:
 

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