, , , ,
This is a geometric sequence since there is a common ratio between each term. In this case, multiplying the previous term in the sequence by gives the next term. In other words, .
This is the form of a geometric sequence.
Substitute in the values of and .
Apply the product rule to .
Combine and .
Identify the Sequence 4 , 6 , 9 , 13.5 , 20.25