subtract+polynomials

What are the steps for subtracting polynomials? 1. Line up all numbers in groups( group and subract like terms) 2. then __**SUBTRACT**__ the numbers from each other 3. find your answer How are adding and subtracting the same?
 * Make sure first polynomial is on top
 * almost same as adding but order matters
 * you do the same steps

How are adding and subtracting polynomials different?
 * the order which you subtract counts
 * and you are subtracting