Question

15 poin lumayan guyss

Answer 1

Penjelasan dengan langkah-langkah:

VII.

1. Diket -2, 4, -8 ,..... U₈=?

  r = 4/-2 = -8/4 = -2, a= -2

  Uₙ = a x rⁿ⁻¹

  U₈ = -2 x (-2)⁸⁻¹

        = -2 x (-2)⁷

        = -2 x (-128)

        = 256

2. Diket 125, 25, 5, 1, .....U₇=?

    r = 25/125 = 5/25 =1/5, a = 125

    U₇ = 125 x (1/5)⁶

          = 5³ x (1/5)⁶

          = (1/5)³

          = 1/125

VIII.

1. Diket U₃ = 18, U₅ = 162

  =

  = 9

  r² = 9

  r = ± 3

Karna rasio positif,

maka Rasio = 3

Mencari a dengan substitusi r ke U₃ atau U₅,

Pakai yang U₃,

U₃ = 18

ar² = 18

a x 3² = 18

a x 9 = 18

a = 2

Semoga Bermanfaat

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