What is the 12th term of the geometric sequence where * A7 = 7 and 10 = -56 O-448 0-224 O -112 0 -96

Question

What is the 12th term of the geometric sequence where *

A7 = 7 and 10 = -56
O-448
0-224
O -112
0 -96

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Mít Mít 3 years 2021-08-04T20:15:27+00:00 2 Answers 10 views 0

Answers ( )

  1. thanhha
    0
    2021-08-04T20:16:29+00:00
    Reply

    Answer:

    Step-by-step explanation:

    A7 = 7

    A10 = -56

    7xRxRxR = -56

    R = -2

    A12 = A10xRxR

    = -56 x -2 x -2

    = 224

  2. Calantha
    0
    2021-08-04T20:17:18+00:00
    Reply

    Answer:

    -224

    Step-by-step explanation:

    Geometric sequence is given by An = A*R^(n-1)

    Given A7 = 7 and A10 = -56

    A10/A7 = -8 = R^(10-7)

    R^3 = -8

    R = -2

    A12 = A10*R^2

    = -56*-2^2

    = -224

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )