Final answer:
The expression simplifies to -3 by combining like terms and constants.
Step-by-step explanation:
The expression 8z + z - 5 - 9z + 2 can be simplified by combining like terms. We can add the coefficients of the z terms together and then combine the constant terms.
To simplify:
- Combine z terms: 8z + z - 9z = 8z + 1z - 9z = (8 + 1 - 9)z = 0z
- Combine constant terms: -5 + 2 = -3
Since 0z is equal to 0, we are left with:
-3
So 8z + z - 5 - 9z + 2 simplifies to -3.