Answer:
To find the next two terms in the sequence, we need to look for a pattern.
The first term is 15, and each subsequent term is obtained by subtracting 1 from the previous term, then subtracting 3, then subtracting 5, and so on. So we can write the sequence as:

Simplifying, we get:

Therefore, the next two terms in the sequence are 1 and -4.
