The sum of the first n terms of an arithmetic sequence is 5n^2-2n .
a)What is the sum of the first two terms.
b)Write the first two terms of the sequence.
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Step-by-step explanation:
Given that,
Sn=5n²-2n
a) S2=5(2)²-2(2)
=5x4-4
=20-4
=16
b) 1st term = S1 = 5(1)²-2(1)
=5-2
=3
2nd term = S2-S1 = 16-3= 13
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