Wafiandfamily Wafiandfamily

25-06-2020
Mathematics

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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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PollyP52 PollyP52

26-06-2020

Answer:

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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