#### Answer

The next three terms are -11, -16, and -21.

#### Work Step by Step

9, 4, -1, -6,...
To get from 9 to 4, you subtract 5.
To get from 4 to -1, you subtract 5.
To get from -1 to -6, you subtract 5.
Each term is five less than the term before it so:
-6-5=-11
-11-5=-16
-16-5=-21