Tentukan 5 suku pertama barisan pertama jika diketahui a=8 dan b=3

[tex] u_{n} = a + (n - 1).b \\ = 8 + (n - 1).3 \\ = 8 + 3n - 3 \\ = 3n + 5 \\ \\ u_{1} = 3(1) + 5 \\ = 3 + 5 \\ = 8 \\ u_{2} = 3(2) + 5 \\ = 6 + 5 \\ = 11 \\ u_{3} = 3(3) + 5 \\ = 9 + 5 \\ = 14 \\ u_{4} = 3(4) + 5 \\ = 12 + 5 \\ = 17 \\ u_{5} = 3(5) + 5 \\ = 15 + 5 \\ = 20 [/tex]

jadii 8, 11, 14, 17, 20,....
smoga membantu :D