Algebra I – Chapter 4

4.2 Adding and Subtracting Polynomials

Adding Polynomials• In order to add polynomials, we need to

combine like terms.

• Ex: (2x – 5y + 2) + (5x + 6y – 7)

Let’s try together:• (2x2y – 3xy2 – y3) + (2x2y – xy2)

Subtracting Polynomials• When you see subtraction, you can either add

the opposite, or just distribute the negative one.

• Ex: (a – 3b +5) – (-a + 2b + 3)

You try:• (3a3 – 2ab2) – (a3 – 4ab2 – b3)

Putting it all together and solving:• 3 – 2x(x – 1) = x(3 – 2x) – (x – 3)

Tonight’s Homework:

Page 149 (31-55 odd)