Question

9. The sum of the first n terms of a sequence is
an^2 +bn Then the sum of the next n terms is​

Answer 1

Answer:

3an²+bn

Step-by-step explanation:

Sₙ = an²+bn

sum of next n terms = S₂ₙ - Sₙ = a(2n)²+b(2n) - an²-bn = 4an²+2bn-an²-bn = 3an²+bn