Penjelasan dengan langkah-langkah:
U3 = a × r² = 48
U7 = a × r⁶ = 3.072
• Mencari rasio.
r⁶/r² = 3.072/48
r⁴ = 64
r = ⁴√64
r = √8
• Mencari a.
a × r² = 48
a × √8² = 48
a × 8 = 48
a = 48/8
a = 6
• Mencari Un.
Un = a . r^(n - 1)
Un = 6 . (√8)^(n - 1)
Un = 6 . 8^((n-1)/2)
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Penjelasan dengan langkah-langkah:
U3 = a × r² = 48
U7 = a × r⁶ = 3.072
• Mencari rasio.
r⁶/r² = 3.072/48
r⁴ = 64
r = ⁴√64
r = √8
• Mencari a.
a × r² = 48
a × √8² = 48
a × 8 = 48
a = 48/8
a = 6
• Mencari Un.
Un = a . r^(n - 1)
Un = 6 . (√8)^(n - 1)
Un = 6 . 8^((n-1)/2)