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7 July, 20:07

Given the following recurrence relation: An = (-2) An-1, with A0 = (-1)

determine the value of a5

+5
Answers (1)
  1. 7 July, 20:15
    0
    Technically you could answer this one by one, by substituting n with 1, 2, 3, 4, then 5. Like here:

    A1 = (-2) A1-1

    = (-2) A0, then substituting A0 with - 1 ...

    = (-2) (-1)

    Which would mean A1=2. Then ...

    A2 = (-2) A2-1

    A2 = (-2) A1

    A2 = (-2) (2)

    Which would mean A2=-4.

    By repeating this process you'd eventually get A4 ...

    A5 = (-2) A4

    if you did the steps right you'd get that A4 is - 16 ...

    A5 = (-2) (-16).

    Then simplify to get your answer.
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