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26 January, 21:48

Write an explicit formula for the sequence 7, 1, - 5, - 11, - 17, ... Then find a14

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  1. 26 January, 21:52
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    An=a1+d (n-1)

    a1 = 7

    find d

    Let's use a2

    a2=1

    1=7+d (2-1)

    1=7+d

    -7 both sides

    d=-6

    explicit formula is

    an=7+-6 (n-1)

    a14=?

    a14=7-6 (14-1)

    a14=7-6*13

    a14=7-78

    a14=-71
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