Final answer:
To add and simplify the given expression, combine the constants and the variables raised to the same powers.
Step-by-step explanation:
To add and simplify the given expression:
- Combine the constants: 8 + 3 + 16 = 27
- Combine the same variables raised to the same powers: 2xy + xy3 + 2xy = 3xy + xy3
So the simplified expression is 27 + 3xy + xy3.