Question

U5=48 u8=-384.nilai u4+u6 adalah.... Tolong bantuannya yah:)

Answer 1

Ar7 = -384
ar4 . r3 = -384
48 . r3 = -384/48
r3 = -8
r = -2

ar4 =48
a . (-2)^4 = 48
a 16 = 48
a = 48/16
a = 3

u4 + u6 = ar3 + ar5
= a(r3 + r5)
= 3(-2^3 +(-2)^5)
= 3 (-8+(-32))
= 3(-40)
u4 + u6 = - 120
jadi, jawabanya yang benar adalah A. -120