Question

When should we use explicit formula

Answer 1

It defines a term of sequence using their position. They are helpful if we want to find a specific term of sequence without finding all of the previous terms.

Answer 2

An explicit formula will create a sequence using n, the number location of each term. If you can find an explicit formula for a sequence, you will be able to quickly and easily find any term in the sequence simply by replacing n with the number of the term you seek.