Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.

Trending News

Promoted
Charly Cen
Charly Cen asked in Sains & MatematikaMatematika · 8 years ago

Tolong jawaban soal barisan geometri..?

jika suku pertama suati barisan geometri = 3 dan suku ke-3 = 12, maka suke ke -5 adalah???

2 Answers

Rating
  • Cingcangkeling
    Lv 7
    8 years ago
    Favorite Answer

    a = U1 = 3

    U3 = 12

    U5 = __ ?

    U3 = ar²

    12 = 3 r²

    r² = 4

    r = 2 atau -2

    U5 = a r^4

    .....= 3 (2)^4

    .....= 48..<-- jawaban

    Ok ?

  • Nur°F
    Lv 7
    8 years ago

    a = 3 dan U3 = 12

    Un = ar^(n-1)

    U3 = 3*r^2 = 12

    r^2 = 12/3 = 4

    r = 2

    U5 = 3*2^4 = 3*16 = 48

Still have questions? Get your answers by asking now.