Download - Lesson 13-3 Pages 678-681
Lesson 13-3 Pages 678-681
Subtracting Polynomials
What you will learn!1. How to subtract polynomials.
What you really need to know!
To subtract polynomials, subtract like terms.
Example 1: Find the difference:
7a7a ++ 44−− (9a(9a ++ 2)2)
-2a-2a ++ 22
(7a + 4) − (9a + 2)
Example 1b: Find the difference:
(8b2 + 6) − (3b2 + 6b + 1)
8b8b22 ++ 66
−−(3b(3b
22 ++ 6b6b ++ 1)1)
5b5b22 −− 6b6b ++ 55
Example 2: Find the difference:
(4 x - 8) − (3x + 9)
4x4x −− 88
−−(3(3xx
++ 9)9)
xx −− 1717
Example 2b: Find the difference:
(7ab + 2b2) − (3a2 + ab + b2)
7ab7ab ++ 2b2b22
−−(3a(3a22 ++ abab ++
bb22))
--3a3a22 ++ 6ab6ab ++ bb22
Example 3:
The length of a rectangle is x2 – 9 x + 10 units. The width is x2 –x units. How much longer is the length than the width?
Example 3: Find the difference:
(x2 – 9x + 10) − (x2 - x)
xx22 −− 9x9x ++ 1010
−− (x(x22 −− x)x)
−− 8x8x ++ 1010
Page 680
Guided Practice
#’s 3-9
Pages 678-679 with someone at home and
study examples!
Read:
Homework: Pages 680-681
#’s 10-26 even
#’s 30-45 all
Practice Quiz 1
Page
756
Lesson 13-3