Question

Sum of first terms of A.P is 3n^2 + 5n. Then what is the first term?

Answer 1

Here's the answer

Sn=3n^2 + 5n
first time is equal to S1
therefore,a1=3+5=8
first time is 8

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Answer 2

Given that,
Sn=3n^2+5n
Put n=1,
Sn=(3×1^2)+(5×1)
=(3×1)+(5×1)
=3+5
=8
ie,
First term =8