Lesson 5.7-5.8
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Transcript Lesson 5.7-5.8
Bellringer
Collect Like Terms
1. 2𝑥 − 5𝑥
−3𝑥
2. 3𝑎 4 − 2𝑎 + 2𝑎 + 𝑎 4
4𝑎4
3. 4𝑥𝑦 2 + 2𝑥 2 𝑦 − 𝑥𝑦 2 + 3𝑥 2 𝑦
3𝑥𝑦 2 + 5𝑥 2 𝑦
5.7- 5.8 Addition and
Subtraction of Polynomials
Adding
Combine all like terms and add the
coefficients.
Example 1
(3 x 2 x 2) (2 x 5 x 5)
2
2
3 x 2 x 2 2 x 5 x 5
2
2
1x 7 x 3
2
Example 2
(31m m 2m 1) (7 m 5m 2m 2)
4
2
4
2
31m m 2m 1 7 m 5m 2m 2
4
2
4
24m 6m 0m 1
4
2
24m 6m 1
4
2
2
Example 3
(4a b 5a 3) (2a b 2a 4)
2
2
4a b 5a 3 2a b 2a 4
2
2
2a b 7 a 1
2
Example 4
(3n3 3m3n 2 5n 3) (5n3 2m3n 2 3m 2n 2)
3n3 3m3n 2 5n 3 5n3 2m3n 2 3m 2n 2
8n3 1m3n 2 3m 7 n 5
Example 5
(2m 5m 2m 4) (m 6m 7 m 10)
4
2
3
2
2m 5m 2m 4 m 6m 7 m 10
4
2
3
2
2m3 11m 2 5m 14 m 4
m 2m 11m 5m 14
4
3
2
Example 6
(3 x y 5 xy 2) ( x y x 2 xy 5)
4
4
3
2
3 x y 5 xy 2 x y x 2 xy 5
4
4
3
2
x y 3 x y x 3 xy 7
4
3
4
2
Subtracting
The Additive Inverse
◦ Change every sign to its opposite!!!!
◦ + becomes –
◦ - becomes +
You MUST distribute the negative to each piece
then collect like terms and add!
Example 2: Find the additive inverse.
4x 7x 8
5
4x 7x 8
5
Example 1: Find the additive inverse.
8x 4 x 3
2
8x 4 x 3
2
Example
3:
Subtract.
2
3
4
2
3
(a 2a 4) (a 4a 3a )
a 2a 4 a 4a 3a
3
3
4
2
5a 1a 4 a
3
2
4
a 5a 1a 4
4
3
2
2
Example 4
(4 x y 2 x y 3xy 6) ( x y 2 x y 2 xy 3)
3
2 2
3
2 2
4 x y 2 x y 3xy 6 x y 2 x y 2 xy 3
3
2 2
3
2 2
3x y 4 x y 1xy 9
3
2 2
Example 5
(3x y 4 xy 1) (4 x y 3x y 3xy 5)
3 2
3 2
2 2
3x y 4 xy 1 4 x y 3x y 3xy 5
3 2
3 2
2 2
7 x y 3x y 7 xy 6
3 2
2 2
Example 6
(5 p 3 p 6) (9 p 5 p 3)
2
2
5p 3p 6 9p 5p 3
2
2
4p 2p 9
2
Assignment
Pg. 233 #’s 12-15
Pg. 238 #’s 11-14