Find the sum of the given polynomials.

ax + by + c, 2ax - 3by + c, and by - c

3ax - by + c

3a + x - bc

3ax + by - cd

bx - 3bc + a

Question

Find the sum of the given polynomials. 

ax + by + c, 2ax - 3by + c, and by - c 


3ax - by + c

3a + x - bc

3ax + by - cd

bx - 3bc + a

anonymous · Answer

$$ax + by + c + 2ax - 3by + c- c $$ is that what you need to find?

anonymous · Answer

I don't know. I don't understand any of it. I'm just trying to get through this class.

anonymous · Answer

i think that is it, because it says "find the sum" which means "add"

anonymous · Answer

Lol I know what "sum" means :p

anonymous · Answer

$$ax + by + c + 2ax - 3by + c+by- c$$

anonymous · Answer

ok then we put plus signs between them and combine like terms

anonymous · Answer

Plus signs in front of everything?

anonymous · Answer

put plus signs between the polynomials, like i wrote above

anonymous · Answer

But there's two minus signs

anonymous · Answer

$$ax + by + c \overbrace{+}^{here} 2ax - 3by + c\overbrace{+}^{here}by- c$$

anonymous · Answer

that is what i meant by putting plus signs between them

anonymous · Answer

Yeah the answer I got from that isn't one of the answer choices

anonymous · Answer

$ax + by + c$ plus $ 2ax - 3by + c$ plus $by - c $
ok lets combine the like terms, meaning the terms with $x$, the terms with $y$ and the constant $c$
we can cheat on this one because for the $c$ terms you have $+c+c-c$

anonymous · Answer

and $c+c-c=c$ just like $5+5-5=5$
only one answer has $c$ by itself, so although we can do the rest as well, that has to be the right one

anonymous · Answer

i am not sure what you got, but for the $x$ terms  you have $ax+2ax$ and that gives you $3ax$

anonymous · Answer

you also have $by-3by+by$ and since $1-3+1=-1$ you have a total of $-by$

anonymous · Answer

final answer$$3ax-by+c$$

anonymous · Answer

so it looks like, for a change, the first answer is right
not sure if this made any sense, but it is the right one