Math, asked by aggarwalhardik686, 7 months ago

sum of the first n terms of AP is 5 and square minus 3 and find the AP and also find the 16th term

Answers

Answered by lakshkon

2

Answer:

152

Step-by-step explanation:

Given,

Sn = 5n2 - 3n an = Sn - Sn - 1

an = 5n2 - 3n - [5(n - 1)2 - 3 (n - 1)]

an = 5n2 - 3n -[5(n2 - 2n + 1) - 3n + 3]

an = 5n2 - 3n - 5n2 + 10n - 5 + 3n - 3

an = 10n - 8

a1 = 2

a2 = 20 - 8 = 12

a3 = 30 - 8 = 22

a16 = 160-8= 152

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