, , ,

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, .

Geometric Sequence:

This is the form of a geometric sequence.

Substitute in the values of and .

Multiply by .

Raise to the power of .

Use the power rule to combine exponents.

Combine the opposite terms in .

Subtract from .

Add and .

Identify the Sequence -5 , 25 , -125 , 625