Numa pg de 4 termos o primeiro é -4 e a razao 3 determine o ultimo termo

Numa pg de 4 termos o primeiro é -4 e a razao 3 determine o ultimo termo

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    A1 = -4
    q = 3
    an = ?
    n = 4

    Termo geral da PG:

    n — 1
    an = a1.q

    4 — 1
    a4 = a1.q

    3
    a4 = a1.q

    3
    a4 = — 4. 3

    a4 = — 4 . 27

    a4 = — 108

    PG: ( — 4, — 12, — 36, — 108)

  • Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
    A1 = -4

    q= 3

    an = a1 . q^{n-1}

    a4 = -4 . 3

    a4 = -4 . 27

    a4= — 108


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88 + = 90