suku pertama suatu barisan geometri

Barder

U7 = ar^6
1/8 = a (-1/2)^6
a = 64/8 = 8

B

^ = pangkat

U7 = ar^6
1 / 8 = a ( - 1/2 )^6
1 / 8 = a ( 1 / 64 )
a = 64 / 8
a = 8 ✔️

Semoga bermanfaat.....
-Prisco