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Verified answer
Mapel = MatematikaKelas = 8 SMP
Bab = Barisan dan Deret
a. Un = 5n + 3
U8 = 5 . 8 + 3
U8 = 43
b. Un = n² + 2n - 3
U8 = 8² + 2 . 8 - 3
U8 = 64 + 16 - 3
U8 = 77
c. Un = 2n - 2/n + 1
U8 = 2 . 8 - 8/2 + 1
U8 = 16 - 4 + 1
U8 = 13
d. Un = ½n (n-1)
U8 = ½ . 8 ( 8-1)
U8 = 4 . 7
U8 = 28
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