Question

diketahui rumus suku ke-n suatu barisan Un=2n²+4,lima suku yg pertama adalah...

Answer 1

•°•Diketahui rumus suku ke-n suatu barisan adlh

• [tex]\color{magenta}{\boxed{\sf{U_{n} = 2n² + 4}}}[/tex]

lima suku yg pertama adlh 6, 12, 22, 36, 54

[tex] \\ \\ [/tex]

Penjelasan dengan langkah-langkah:

Rumus

• [tex]\color{magenta}{\boxed{\sf{U_{n} = 2n² + 4}}}[/tex]

[tex] \: [/tex]

[tex]\sf{U_1}[/tex] = 2(1²) + 4

[tex]\sf{U_1}[/tex] = 2.1 + 4

[tex]\sf{U_1}[/tex] = 2 + 4

[tex]\sf{U_1}[/tex] = 6

[tex] \: \\ \: [/tex]

[tex]\sf{U_2}[/tex] = 2(2²) + 4

[tex]\sf{U_2}[/tex] = 2.4 + 4

[tex]\sf{U_2}[/tex] = 8 + 4

[tex]\sf{U_2}[/tex] = 12

[tex] \\ \: [/tex]

[tex]\sf{U_3}[/tex] = 2(3²) + 4

[tex]\sf{U_3}[/tex] = 2.9 + 4

[tex]\sf{U_3}[/tex] = 18 + 4

[tex]\sf{U_3}[/tex] = 22

[tex] \\ \: [/tex]

[tex]\sf{U_4}[/tex] = 2(4²) + 4

[tex]\sf{U_4}[/tex] = 2.16 + 4

[tex]\sf{U_4}[/tex] = 32 + 4

[tex]\sf{U_4}[/tex] = 36

[tex] \\ \: [/tex]

[tex]\sf{U_5}[/tex] = 2(5²) + 4

[tex]\sf{U_5}[/tex] = 2.25 + 4

[tex]\sf{U_5}[/tex] = 50 + 4

[tex]\sf{U_5}[/tex] = 54

[tex] \: [/tex]

Maka, 5 suku pertamanya

6, 12, 22, 36, 54

[tex] \\ \\ [/tex]

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[tex] \: [/tex]

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