Question

the sum of n terms of an ap is 5 square minus 3 find the AP and also is its 10th​

Answer 1

Step-by-step explanation:

S = 5n^2 - 3

S1 = a = 5(1) - 3 = 2

S2 = a + a2 = 5(2)^2 -3 = 17

a2 = 17 - 2 = 15

d = a2 - a = 15 - 2 = 13

[a = 2 ; d = 13]

A.P - 2,15,28,...

A = a + (n-1)d

A = 2 + (10-1)(13) = 2 + 9(13) = 2 + 117

10th term = A = 119

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