Roboguru

Tuliskan 5 suku pertama barisan berikut! b.

Pertanyaan

Tuliskan 5 suku pertama barisan berikut!

b.   straight U subscript straight n equals 3 straight n squared minus 2 straight n  

Pembahasan Soal:

  • Suku ke-1

table attributes columnalign right center left columnspacing 0px end attributes row cell straight U subscript straight n end cell equals cell 3 straight n squared minus 2 straight n end cell row cell straight U subscript 1 end cell equals cell 3 times 1 squared minus 2 times 1 end cell row blank equals cell 3 minus 2 end cell row blank equals 1 end table 

  • Suku ke-2

table attributes columnalign right center left columnspacing 0px end attributes row cell straight U subscript straight n end cell equals cell 3 straight n squared minus 2 straight n end cell row cell straight U subscript 2 end cell equals cell 3 times 2 squared minus 2 times 2 end cell row blank equals cell 12 minus 4 end cell row blank equals 8 end table 

  • Suku ke-3

table attributes columnalign right center left columnspacing 0px end attributes row cell straight U subscript straight n end cell equals cell 3 straight n squared minus 2 straight n end cell row cell straight U subscript 3 end cell equals cell 3 times 3 squared minus 2 times 3 end cell row blank equals cell 27 minus 6 end cell row blank equals 21 end table 

  • Suku ke-4

table attributes columnalign right center left columnspacing 0px end attributes row cell straight U subscript straight n end cell equals cell 3 straight n squared minus 2 straight n end cell row cell straight U subscript 4 end cell equals cell 3 times 4 squared minus 2 times 4 end cell row blank equals cell 48 minus 8 end cell row blank equals 40 end table  

  • Suku ke-5

table attributes columnalign right center left columnspacing 0px end attributes row cell straight U subscript straight n end cell equals cell 3 straight n squared minus 2 straight n end cell row cell straight U subscript 5 end cell equals cell 3 times 5 squared minus 2 times 5 end cell row blank equals cell 75 minus 10 end cell row blank equals 65 end table 

Jadi, 5 suku pertama barisan tersebut adalah 1 comma space 8 comma space 21 comma space 40 comma space 65.

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 03 Juni 2021

RUANGGURU HQ

Jl. Dr. Saharjo No.161, Manggarai Selatan, Tebet, Kota Jakarta Selatan, Daerah Khusus Ibukota Jakarta 12860

Coba GRATIS Aplikasi Ruangguru

Produk Ruangguru

Produk Lainnya

Hubungi Kami

Ikuti Kami

©2021 Ruangguru. All Rights Reserved