tentukan nilai x dari penjumlahan suku-suku barisan geometri 2+4+8+...+2^x=2046

un = 2^x
a = 2
r = 4/2 = 2
Sn = 2(2^n - 1) / (2-1)
2046 = 2 (2^n-1) / 1
1023 = 2^n - 1
1024 = 2^n
2^10 = 2^n
n = 10
Un = 2^x
ar^9 = 2^x
2 (2)^9 = 2^x
2^10 = 2^x
x = 10