tolong di jawab no 5,8,9 di kumpulkan besok cepetan aku kasih poin 10

5.c.
8.a.
9.d.
semoga membantu

U₄ = 4
U₉ = 34

b = (U₉ - U₄) / (9 - 4)
b = (34 - 4) / (5)
b = 30 / 5
b = 6

U₄ = a + 3b
4 = a + 3(6)
a = -14

U₁₅ = a + 14b
=>-14 + 14(6)
=>70

U₅ = a + 4b
=>-14 + 4(6)
=> 10

U₁₅/U₅ = 70/10 = 7

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a = 2

U₄ = 54
ar³ = 54
2r³ = 54
r³ = 27
r = 3

Un = arⁿ⁻¹
4374 = 2 • 3ⁿ⁻¹
2187 = 3ⁿ/3
6561 = 3ⁿ
n = 8

Jadi 4374 adalah suku ke 8

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U₃ x U₆/U₅ = 16/8
ar² x ar⁵/ar⁴ = 2
ar³ = 2
U₄ = 2

r = U₅/U₄
r = 8/2
r = 4

ar³ = 2
a(4)³ = 2
a = 2/64
a = 1/32

S₆ = a(r⁶ - 1) / (r - 1)
=>1/32 (4⁶ - 1) / (4 - 1)
=>(128 - 1/32) / 3
=>42 ²¹/₃₂