Question

(4) If Sn-3n^2+2n, then write a2
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Answer 1

sn=3n²+2n

s1=3+2=5

S2=3.4+4=16

a2 = 16-5 =11

Answer 2

Step-by-step explanation:

Sn = 3n²+2n

S1 = A1 = 3(1)²+2(1) = 3+2 = 5

S2 = A1+A2 = 3(2)²+2(2) = 12+4= 16

and

A1+A2=16

A1+A2=165+A2=16

A1+A2=165+A2=16A2= 16-5=11