Question

The sum of first n term of an arithmetic sequence is3n^2-6n
Calculate first term and common difference

Answer 1

Step-by-step explanation:

Sn=3n²-6n

If n=1, then

S1=3(1)²-6(1)=-3

If n=2, then

S2=3(2)²-6(2)

=3(4)-6(2)=12-12=0

A2=S2-S1=0-(-3)=3

S1=A=-3

d=a2-a1=3-(-3)=3+3=6.

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Answer 2

Answer:

answer attached in photo