polynomial adding!

i have a test to assess my skills tommorrow and i need to know how to add polynomials..

could someone walk me through this question and how to come up with an answer...

its question 5 of this link (dont worry, the link leads to a practice assessment)

About Clark- COMPASS Sample Algebra Skills Test

This is as simple as adding numbers, but there are some properties you need to remember:






I don't think you'll need anymore than that, now let's look at the problem:



Using property 3, we can distribute the negative to the terms inside the parentheses:





Now, we regroup the like variables together:



Using property 1, we can simplify each like term:



That would be choice 5 or the last choice.

Go ahead and simplify this expression:
-6a + 3b - 2( 2a + 5b )

Begin by identifying the coefficient (this would be the "a" in Aryth's property 3), then distribute it to each term, then add all like terms.