Suku ke-9 dan suku ke-n dari barisan 4, -8, 16, -32,....
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r = -8/4 = -2
U9 =?
Un = ?
Un = ar^n-1
U9 = 4×(-2)^9-1
U9 = 4 × (-2)^8
U9 = 4 × 256
U9 = 1024
Un = ar^n-1
Un = 4×(-2)^n-1
Un = 2² × (-2)^n-1