Question

Mohon Bantuannya... terimakasih :3

Answer 1

1) diket  s5 = 44
r = -2
u4 + u5?????
s5 = {a(r^n - 1}/r-1
44 = a((-2)^5 -1) -2-1
44= a(-32 -1) -3
44=  -33a/-3
44 = 11a
4= a
u4 + u5 = ar^3 + ar^4
= 4(-2)^3 + 4(-2)^4
= -32 + 64
= 32

2) a= 4, u5 = 100
u5 = ar^4
100= 4r^4
25 =r^4
√5 = r
a = 4√5
b = 20
c=20√5

ac/b= 4√5 x 20√5 / 200
= 20