Jawabanmu

2014-04-06T16:30:47+07:00
Diketahui: U2=6 dan U5=-48
U5/U2= ar^4/ar= -48/6
r^3= -8
r = -2
2014-04-06T16:36:21+07:00
Un = u1.r n-1
u2 = u1. r 2-1
6 = u1 .r

un = u1 . r n-1
u5 = u1 . r 5-1
-48 = u1 . r4

6 = u1.r 
-48 = u1.r4
 
  = 1
-48 = r4
6r4 = -48
  r4 = 4√8 
     r= 2
maaf ya kalo seandai nya salah