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ar^4-1=-54
ar^3=-54
ar^6-1=-486
ar^5=-486
U6=-486
---- -------
U4. -54
ar^5=-486
------- --------
ar^3. -54
r^2=-486/-54
r^2=9
r=√9
r=3
tex]U_{4} [/tex] = a
tex]U_{4} [/tex] = ar³
-54 = ar³
= -486
= a
= a
-486 =a
r ==
\frac{(-54) ^{5} }{(-486) ^{3}} = a²
4=a²
a=2 atau a= -2
r=
r=
r=
r=3
jadi rasionya adalah 3