Page 16 - BARISAN & DERET GEOMETRI

BARISAN GEOMETRI

SOLUSI CONTOH SOAL 2

Diketahui :

2
U = -8 ar = -8
3

U = -32 ar = -32
4
5
maka : ar 4   32

ar 2  8

r = 4 r = 2
2

Karena ar = -8 a(2) = -8
2
2
a = -2

Sehingga: U = ar (7-1) = ar 6
7
= (-2)(2) 6

U = -128
7