Question

answer this question ???​

Answer 1

Answer:

Step-by-step explanation:

Formula for sum of n terms of an AP is

Sn = n/2(2a+(n-1)d)

=> According to question

5n^2+3n=r.h.s

n(5n+3)=n/2(2a+(n-1)d)

Cancel n both sides

(5n+3)2=2a+(n-1)d

Answer 2

Answer:

thanks for this question

Step-by-step explanation:

first of all, formula of n term AP is Sn= n/2(2a+(n-1)d

now let's start,

5n^2+3n= r.h.s

n(5n+3)=n/2(2a+n-1)d

(5n+3)2=2a+(n-1)d

please follow me and Mark as brainliest