Question

Tolong banget yah Nomor 13-16

Answer 1

Etahui :
a = 1
U2 = 3
U3 = 5

Ditanya :
49 = Un?

Jawab :
b = U3 - U2 = U2 - a
b = 5 - 3 = 3 - 1
b = 2

Un = a + (n - 1)b
49 = 1 + (n - 1)2
49 = 1 + 2n - 2
2n = 50
n = 25 (D)

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Diketahui :
a = 1
r = 2

Jawab :
Rumus Un?

Jawab :
Un = a ×
Un = 1 ×
Un = (B)

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Diketahui :
a = -3
U2 = 6
U3 = -12

Ditanya :
-192 = Un?

Jawab :
r = =
r = =
r = -2

Un = a ×
-192 = -3 ×
= 64
=
n - 1 = 6
n = 7 (C)

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Diketahui :
a = 3
U4 = 81

Ditanya :
U5?

Jawab :
Un = a ×
U4 = 3 ×
81 = 3 × r³
r³ = 27
r =
r = 3

Un = a ×
U5 = 3 ×
U5 = 3 × 3⁴
U5 =
U5 = 243 (D)