Create an example of how to add two trinomials and how to subtract two trinomials.
Can you give me an example of two trinomials that can be added together and subtracted?
Preferably positive, and if you can please explain how to add and subtract them?

Question

Create an example of how to add two trinomials and how to subtract two trinomials. 
Can you give me an example of two trinomials that can be added together and subtracted?
Preferably positive, and if you can please explain how to add and subtract them?

anonymous · Answer

$$x^3+2x^2-x+3$$ and $$x^3-x^2+x-2$$

anonymous · Answer

By adding them together you get $$2x^3+x^2$$

anonymous · Answer

Subtracting the second from the first will give you $$3x^2-2x+5$$

anonymous · Answer

Ahh sum has an error, the first should be $$2x^3+x^2$$

anonymous · Answer

Does this make sense?

anonymous · Answer

No, sorry can you explain how you added and subtracted them?  To add do you just combine the like terms and then add both together?

anonymous · Answer

Exactly, just look at the numbers before the x and add them together if they have the same x term. For subtraction you do the same except subtract instead of add. If we look at each term individually it becomes much easier. For the x^3 term in both we have 1 and 1. Adding gives us 2, subtracting gives us 0. All we have to do is do the same thing for the other terms as well.

anonymous · Answer

Ok that makes sense! But what did you mean when you said the sum had an error?

anonymous · Answer

The first time I added them together I mistyped it and left off the constand +1 at the end. The second one was right.

anonymous · Answer

So that was the sum for  when you added them together?

anonymous · Answer

Sorry about this but I still don't understand how you got what you did when subtracting...can you explain it one more time?