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26 August, 11:50

Find the sum of the first seven terms of the geometric series 8, - 24, 72, ...

4,376

4,280

5,832

5,836

+3
Answers (1)
  1. 26 August, 12:13
    0
    4376

    Step-by-step explanation:

    8, - 24, 72, - 216, 648, - 1944, 5832

    Multiply the next number by - 3

    8 x - 3 = - 24

    -24 x - 3 = 72

    72 x - 3 = - 216

    -216 x - 3 = 648

    648 x - 3 = - 1944

    -1944 x - 3 = 5832

    adding all 7 numbers

    8 + (-24) + 72 + (-216) + 648 + (-1944) + 5832 = 4376
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