Question

If Sn=2n square +3n then find d​

Answer 1

Answer:

Sn = 2n²+3n

S1 = X1 = 2 × 1² + 3 × 1

= 2 × 1 + 3 = 5

S2 = 2 × 2² + 3 × 2

= 2 × 4 + 6

= 8 + 6 = 12

X2 = S2 - X1 = 12 - 5 = 7

d = 7 - 5 = 2

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