Question

if the sum of first n terms of AP is given by SN= 3n² - 4 . find the nth term


pls help me​

Answer 1

Answer:

Thus, the nth term of the A.P = 6n – 7.

Answer 2

Answer:2n-3

Step by step explaination:

Sn=3n²-4

S1=3(1)²-4=3-4=-1=a1

S2=3(2)²-4=3*4-4=12-4=8

S2=8----(i)

S2=n/2[2a+(n-1)d]

=2/2[2(3)+(2-1)d]

=1[6-d]

S2=6-d

8=6-d (from (i) )

d=2

an=a+(n-1)d

=-1+(n-1)2

=-1+2n-2

an=2n-3

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