Jawaban:
Jumlah 5 suku pertama adalah 35
Penjelasan dengan langkah-langkah:
Un = 2n + 1
U1 = 2(1) + 1 = 2 + 1 = 3
U5 = 2(5) + 1 = 10 + 1 = 11
[tex]\begin{aligned}S_n &= \frac{n}{2} (a + U_n) \\ S_5 &= \frac{5}{2} (a +U_5 ) \\&= \frac{5}{2} (3 + 11) \\ &= \frac{5}{2} (14) \\ &= 5 \times 7 \\ &=35 \end{aligned}[/tex]
[tex] \\ [/tex]
#LearnWithPanda
[tex]U_n = 2n + 1[/tex]
[tex]U_1 = 2(1) + 1[/tex]
[tex]U_1 = 2·1 +1[/tex]
[tex]U_1 = 2+ 1[/tex]
[tex]U_1 = 3[/tex]
[tex]U_2 = 2(2) + 1[/tex]
[tex]U_2 = 2·2 + 1[/tex]
[tex]U_2 = 4 + 1[/tex]
[tex]U_2 = 5[/tex]
[tex]U_3 = 2(3) + 1[/tex]
[tex]U_3 = 2·3 + 1[/tex]
[tex]U_3 = 6 + 1[/tex]
[tex]U_3 = 7[/tex]
[tex]U_4 = 2(4) + 1[/tex]
[tex]U_4 = 2·4 + 1[/tex]
[tex]U_4 = 8 + 1[/tex]
[tex]U_4 = 9[/tex]
[tex]U_5 = 2(5) + 1[/tex]
[tex]U_5 = 2·5 + 1[/tex]
[tex]U_5 = 10 + 1[/tex]
[tex]U_5 = 11[/tex]
[tex]U_1 + U_2 + U_3 + U_4 + U_5 = [/tex]
[tex]3 + 5 + 7 + 9 + 11 = [/tex]
[tex]35[/tex]
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Verified answer
Jawaban:
Jumlah 5 suku pertama adalah 35
Penjelasan dengan langkah-langkah:
Un = 2n + 1
U1 = 2(1) + 1 = 2 + 1 = 3
U5 = 2(5) + 1 = 10 + 1 = 11
[tex]\begin{aligned}S_n &= \frac{n}{2} (a + U_n) \\ S_5 &= \frac{5}{2} (a +U_5 ) \\&= \frac{5}{2} (3 + 11) \\ &= \frac{5}{2} (14) \\ &= 5 \times 7 \\ &=35 \end{aligned}[/tex]
[tex] \\ [/tex]
#LearnWithPanda
*
[tex]U_n = 2n + 1[/tex]
*
[tex]U_1 = 2(1) + 1[/tex]
[tex]U_1 = 2·1 +1[/tex]
[tex]U_1 = 2+ 1[/tex]
[tex]U_1 = 3[/tex]
*
[tex]U_2 = 2(2) + 1[/tex]
[tex]U_2 = 2·2 + 1[/tex]
[tex]U_2 = 4 + 1[/tex]
[tex]U_2 = 5[/tex]
*
[tex]U_3 = 2(3) + 1[/tex]
[tex]U_3 = 2·3 + 1[/tex]
[tex]U_3 = 6 + 1[/tex]
[tex]U_3 = 7[/tex]
*
[tex]U_4 = 2(4) + 1[/tex]
[tex]U_4 = 2·4 + 1[/tex]
[tex]U_4 = 8 + 1[/tex]
[tex]U_4 = 9[/tex]
*
[tex]U_5 = 2(5) + 1[/tex]
[tex]U_5 = 2·5 + 1[/tex]
[tex]U_5 = 10 + 1[/tex]
[tex]U_5 = 11[/tex]
*
[tex]U_1 + U_2 + U_3 + U_4 + U_5 = [/tex]
[tex]3 + 5 + 7 + 9 + 11 = [/tex]
[tex]35[/tex]