Answer:
[tex]3ax-by+c[/tex]
a is the correct option.
Step-by-step explanation:
We have to find the sum of the polynomials ax + by + c, 2ax - 3by + c, and by - c .
Writing these polynomial in sum form
[tex]ax+by+c+2ax-3by+c+by-c[/tex]
Group the like terms, we get
[tex](ax+2ax)+(by-3by+by)+(c+c-c)[/tex]
Combine the like terms, we get
[tex]3ax-by+c[/tex]
a is the correct option.
