Tentukan lima suku pertama barisan bilangan dengan rumus suku ke-n berikut!
a. Un = 3(n + 1) + 2
Jawab: U1 = 3(1 + 1) + 2 = 8
U2 = 3(2 + 1) + 2 = 11
U3 = 3(3 + 1) + 2 = 14
U4 = 3(4 + 1) + 2 = 17
U5 = 3(5 + 1) + 2 = 20
b. Un = n^2 - 4n + 7
Jawab: U1 = 1^2 - 4(1) + 7 = 4
U2 = 2^2 - 4(2) + 7 = 3
U3 = 3^2 - 4(3) + 7 = 4
U4 = 4^2 - 4(4) + 7 = 7
U5 = 5^2 - 4(5) + 7 = 12
c. Un = (n + 1)^2 - 5
Jawab: U1 = (1 + 1)^2 - 5 = -1
U2 = (2 + 1)^2 - 5 = -5
U3 = (3 + 1)^2 - 5 = -4
U4 = (4 + 1)^2 - 5 = 1
U5 = (5 + 1)^2 - 5 = 4
d. Un = 2^n - n
Jawab: U1 = 2^1 - 1 = 1
U2 = 2^2 - 2 = 2
U3 = 2^3 - 3 = 5
U4 = 2^4 - 4 = 12
U5 = 2^5 - 5 = 27
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