Find the sum of the geometric series given a1=−2, r=2, and n=8. A. -510 B. -489 C. -478 D. 2

Question

Find the sum of the geometric series given a1=−2, r=2, and n=8.
A. -510
B. -489
C. -478
D. 2

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Thiên Di 6 months 2021-07-16T20:47:54+00:00 1 Answers 62 views 0

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    2021-07-16T20:49:25+00:00

    Answer:

    A. -510

    Step-by-step explanation:

    We are given the variable values:

    • a = -2
    • r = 2
    • n = 8

    Geometric series formula:

    s =  \frac{a( {r}^{n} \times - 1) }{r - 1}

    Plugging in values we have:

    s = \frac{ - 2( {2}^{8} - 1) }{2 - 1}

    Simplifying the equation we are left with:

      \frac{ - 2(255)}{1}  =  - 510

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