Question

the sum of first m terms of an ap is 4m^2 -m find the first four terms
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Answer 1

Answer:

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Answer 2

Answer:

a1 = 3

a2 = 11

a3 = 19

a4 = 27

Step-by-step explanation:

Sm = 4m²-m

S1 = 4-1 = 3 = a1

S2 = 16-2 = 14

S3 = 36-3 = 33

S4 = 64-4 = 60

S5 = 100-5 = 95

so, a2 = S2-S1 = 14-3 = 11

a3 = S3-S2 = 33-14 = 19

a4 = S4-S3 = 60-33 = 27