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30 June, 16:30

If the nth term of a number sequence is n squared+2n find the first 3 terms and the 10th term

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  1. 30 June, 20:12
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    First 3 terms are 3, 8, 15.

    10th term = 120.

    Step-by-step explanation:

    an = n^2 + 2n

    a1 = 1^2 + 2*1 = 3

    a2 = 2^2 + 2*2 = 8

    a3 = 3^2 + 2*3 = 15.

    a10 = 10^2 + 20 = 120.
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