Final answer:
The explicit formula for the second sequence is 2n².
Step-by-step explanation:
Mathematics
The explicit formula for the first sequence is f(n) = 2(n-1) -1. To find the explicit formula for the second sequence, we can imagine taking (n - 1) from the last term and adding it to the first term. This gives us the expression 2[n + 3 + .... + (2n - 3) + n], which simplifies to 2n².