5. Lima suku pertama dari rumus suku ke-n 3n+n² adalah….

[tex]u_{n} = 3n + {n}^{2} \\ u_{1} = 3(1) + {1}^{2} = 3 + 1 = 4 \\ u_{2} = 3(2) + {2}^{2} = 6 + 4 = 10 \\ u_{3} = 3(3) + {3}^{2} = 9 + 9 = 18 \\ u_{4} = 3(4) + {4}^{2} = 12 + 16 = 28 \\ u_{5} = 3(5) + {5}^{2} = 15 + 25 = 40[/tex]
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