Jawabanmu

2014-08-29T20:29:49+07:00
R= -3/1 = -3
Un= a.r^n-1
= 1.-3^n-1
=3^n-1

1,-3,9,-27,81
kok hsil nya 81 gmna caranya
U5= (-3)^5-1 = (-3)^4 = 81
oke mksihh bnyakk