Question

If the sum of ‘n’ terms of an Arithmetic progression is Sn=3n^2+5n then find its
common difference
please help me

Answer 1

Answer:

14

Step-by-step explanation:

see attachment

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Answer 2

Answer:

6

Step-by-step explanation:

Sn = 3n^2 + 5n

Therefore, let n = 1

S1 = 3(1)^2 +5(1)

S1 = 3+5 = 8

Now Let n= 2

S2 = 3*4+10

= 22

Now, a1 = S1 = 8

a2 = S2 - S1 = 22-8 = 14

Now d = a2-a1 = 14-8 = 6

6 is the common difference.