Question

Write down the 3rd term in the sequence given by: T(n) = 2n² + n

Answer 1

T(3) = 21

Explanation:

To find the third term, substitute n = 3 into T(n) , that is

T(3) = 2(3)² + 3 = 2(9) + 3 = 18 + 3 = 21