Answer:
a. 13xyz + 9 + 2xyz + 3
Combine the coefficents of the like monomials.
(13 + 2 = 15)
15xyz + 9 + 3
Add the constants (9 + 3 = 12).
Answer: 15xyz + 12
b. 6ab + (–2ab) + 4 + 6
Combine the coefficents of the like monomials.
[6 + (–2) = 4]
4ab + 4 + 6
Add the constants (4 + 6 = 10).
Answer: 4ab + 10
Step-by-step explanation:
straight from Penn
