Find the next two terms of the following sequence 13, 4, -11,-
enter the terms separated by a comma.

13 - 9 = 4, 4 - 15 = -11, -11 - 21 = -32
What you're subtracting by increases by 6 each time.

The next two terms are -59 and -92; if you need me to explain this answer further, let me know.