Question

sum of nth term of an Ap is 2n²-3n find the first term and common difference

if you answered this question correctly I will mark you brain list and give thanks to you...Dont post some wrong answers..​

Answer 1

Sn=2n²-3n

S1=2(1)²-3(1) S2=2(2)²-3(2)

S1=2-3 S2=8-6

S1=-1 S2=2

S1=A1

First term is -1

A1+A2=S2

-1+A2=2

A2=2+1

A2=3

d=A2-A1

d=3-(-1)

d=4