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Bab Barisan dan DeretMatematika SMP Kelas VIII
Geometri
r = U2 : U1
= (-36) : 72
= -1/2
Un = a x rⁿ⁻¹
= 72 x (-1/2)ⁿ⁻¹
= 72 x (-1/2)ⁿ x (-1/2)⁻¹
= 72 x (-1/2)ⁿ x (-2)
= -144 x (-1/2)ⁿ