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Selesaikan persamaan berikut dengan menggunakan Metode Frobenius 
xy” + (1 – 2x)y’ + (x – 1)y = 0 
Jawab : 
xy” + (1 – 2x)y” + (x – 1)y = 0
Koefisien → mencari dan 
, 
Sehingga = 0 
(akar kembar) 
Sehingga solusi (akar-akar persamaan indikator, teorema 2) 
, X > 0 
Mencari koefisien 
m - 1 = s 
m = s + 1
Koefisien 
s a as s 
+ - - 
[(2 1) ] 
2 2 
1 
s r sr s r 
+ + + + + 
as+1 = 2 2 2 1 
untuk r1 = r2 = 0 , maka : 
s a as s 
+ - - 
s s 
[(2 1) ] 
2 
as+1 = 2 1 
1 
+ + 
= 
s a as s 
+ - - 
s 
[(2 1) ] 
2 
1 
+ 
( 1)
1 0 a a a - a 
+ - 
[(2.1 1) ] 3 
1 0 
S = 1 ® a= (1 1) 
4 
2 2 
= 
+ 
2 1 a a a - a 
+ - 
[(2.2 1) ] 5 
2 1 
S = 2 ® a= (2 1) 
9 
3 2 
= 
+ 
11 5 
15 5 4 
5(3 ) 
= 9 
36 
36 
4 
1 0 1 1 0 
1 
1 0 
a a a a a a 
a a 
- 
= 
- - 
= 
- 
- 
Solusinya adalah : 
11 5 1 0 a - a 
= + + + 36 
+ …. 
, X > 0 
=

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14257017 metode-frobenius (1)

  • 1. Selesaikan persamaan berikut dengan menggunakan Metode Frobenius xy” + (1 – 2x)y’ + (x – 1)y = 0 Jawab : xy” + (1 – 2x)y” + (x – 1)y = 0
  • 2. Koefisien → mencari dan , Sehingga = 0 (akar kembar) Sehingga solusi (akar-akar persamaan indikator, teorema 2) , X > 0 Mencari koefisien m - 1 = s m = s + 1
  • 3. Koefisien s a as s + - - [(2 1) ] 2 2 1 s r sr s r + + + + + as+1 = 2 2 2 1 untuk r1 = r2 = 0 , maka : s a as s + - - s s [(2 1) ] 2 as+1 = 2 1 1 + + = s a as s + - - s [(2 1) ] 2 1 + ( 1)
  • 4. 1 0 a a a - a + - [(2.1 1) ] 3 1 0 S = 1 ® a= (1 1) 4 2 2 = + 2 1 a a a - a + - [(2.2 1) ] 5 2 1 S = 2 ® a= (2 1) 9 3 2 = + 11 5 15 5 4 5(3 ) = 9 36 36 4 1 0 1 1 0 1 1 0 a a a a a a a a - = - - = - - Solusinya adalah : 11 5 1 0 a - a = + + + 36 + …. , X > 0 =