Question

the sum of n terms of an AP is 2n² + 5n. Then the common difference of AP is​

Answer 1

Answer:

First put the value of n=1 in first step and find a1 after that find s2 then subtract S1 (a1) from s2 then u will get a2 then subtract aq from a2

Answer 2

Answer:

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Step-by-step explanation:

Sn=2n^2+5n

taking n=1

we get

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

S1=2+5

S1=7

S1=A1=a=7

taking n=2

we get

S2=8+10

S2=18

A2=S2-S1

A2=11

similarly taking n=3 we get

S3=33

A3=S3-S2

A3=15

so our AP is 7,11,15

and common difference is 4

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HOPE IT HELPS YOU