Question

4. If the sum of first m terms of an AP is 2m2 + 3m, then what is the 2nd term?
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Answer 1

Step-by-step explanation:

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Answer 2

Answer:

$s_{m} = 2 {m}^{2} + 3m$

$s_{1} = 2 + 3 = 5 = a_{1}$

$s_{2} = 2 \times 4 + 3 \times 2 = 8 + 6 = 14 = a_{1} + a_{2}$

$a_{2} = s_{2} - s_{1} = 14 - 5 = 7$