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10 September, 09:34

Find an explicit formula for the arithmetic sequence - 31,-27,-23,-19, ...

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  1. 10 September, 12:23
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    First term (a) = - 31

    Common Difference (d) = - 27 - (-31) = - 27 + 31 = 4

    nth term = a + (n - 1) d = - 31 + (n - 1) 4 = - 31 + 4n - 4 = 4n - 35

    Hence, the formula is 4n - 35.
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