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Verified answer
Un = 5n² + 3U₁ = 5(1²) + 3 = 5(1) + 3 = 5 + 3 = 8
U₂ = 5(2²) + 3 = 5(4) + 3 = 20 + 3 = 23
U₃ = 5(3²) + 3 = 5(9) + 3 = 45 + 3 + 48
U₄ = 5(4²) + 3 = 5(16) + 3 = 80 + 3 = 83
U₅ = 5(5²) + 3 = 5(25) + 3 = 125 + 3 = 128
Jadi barisannya yaitu 8, 23, 48, 83, 128, ....
Kelas : IX
Materi : Barisan dan Deret
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Un = 5n^2 + 3
U1 =5(1)^2 +3 = 5(1) + 3 = 8
U2=5(2)^2 +3 = 5(4) + 3 = 23
U3=5(3)^2 +3 = 5(9) + 3 = 48
U4=5(4)^2 +3 = 5(16) + 3 = 83
U5=5(5)^2 +3 = 5(25) + 3 = 128
Jadi, lima suku pertama barisan tersebut adalah 8, 23, 48, 83, dan 128.