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a = 1 ; r = -1
Un = a.rⁿ⁻¹
Un = 1.(-1)ⁿ⁻¹
Un = 1.(-1)⁻¹.(-1)ⁿ
Un = -1.(-1)ⁿ
b. 2, 8, 32, ...
a = 2 ; r = 4
Un = a.rⁿ⁻¹
Un = 2.(4)ⁿ⁻¹
Un = 2.(4)⁻¹.(4)ⁿ
Un = (2/4).(4)ⁿ
Un = (1/2).4ⁿ
c. 5, 5/2, 5/4, ...
a = 5 ; r = 1/2
Un = a.rⁿ⁻¹
Un = 5.(1/2)ⁿ⁻¹
Un = 5.(1/2)⁻¹.(1/2)ⁿ
Un = (5.2).(1/2)ⁿ
Un = (10).(1/2)ⁿ