Question

nothing

Answer 1

Man oh man!!! They are really having a hard time thinking up problems, aren't they.
If I were you, I would choose some of the listed expressions and then multiply and add and divide or whatever you want to do.
Be sure to keep track of your steps because the problem say to prove that your last thing is equal to your first thing and it will be easier if you know what you did to get there.

Answer 2

I will give a simple example:
Here is my new polynomial identity:
5x+5a-(3x+3a)=2x+2a

Answer 3

And here is my proof that my new polynomial identity is true:
5x+5a-(3x+3a)=
5x+5a-3x-3a=
5x-3x+5a-3x=
2x+2a

Answer 4

Pick some numbers for your variables.
Substitute them and show that both sides represent the same number.

Answer 5

your choice