1. 8-6 Factoring trinomials (a>1)
Quiz this Friday!
8-6 Factoring trinomials (a>1)
Please work on the following problems on your notes
(start before the bell rings):
Warm up:
#1: Factor: y6 – 25x4 #3: Factor x2 + 6x + 8
#2: 4x2 - 36
a) Name polynomial (by terms)
b) Name polynomial (by degree)
c) Factor

2. 8 2 4 6 1st•3rd 2nd x2 + 4x +2x + 8 (y3 + 5x2) (y3 - 5x2) (x+2)(x+4)
Warm up:
#1: Factor: y6 – 25x #3: Factor x2 + 6x + 8
#2: 4x2 - 36
a) Name polynomial (by terms)
b) Name polynomial (by degree)
c) Factor
(y3 + 5x2) (y3 - 5x2)
x2 + 4x +2x + 8
(x+2)(x+4)
Binomial
1st•3rd 8
Quadratic
(2x + 6) (2x – 6) OR
2(x+3)(2)(x-3)
4(x2 – 9) OR
4(x+3)(x-3) 2 4 6
2nd

3. Remember: X-BOX METHOD
G C F
1st•3rd
First Term
From “x”
G C F
From “x”
Last Term
2nd
Box is only necessary if there is a number infront of the x2
2 # that multiply to top
and add to bottom

4. Example 1 Factor 3x2 + 2x – 8 3x2 + 6x – 4x – 8 x 2 -24 3x 3x2 6x 6 -4
1st•3rd
-24 3x
3x2 6x 6 -4 -4
-4x -8 2
2nd
Answer: (3x – 4)(x + 2)

5. Example 2 Factor 4x2 - 4x – 15 4x2 -10x + 6x – 15 2x -5 -60 2x 4x2
1st•3rd
-60 2x
4x2
-10x
-10 6 3 6x
-15 -4
2nd
Answer: (2x + 3)(2x – 5)

6. TOO:

7. Factor out the GCF first!
Example 3
GCF
= 3
Factor completely.
18x2 + 21x + 6
3(6x2 + 7x + 2)
Factor out the GCF first!
3(6x2 + 4x + 3x + 2) 3x 2 12 2x
6x2 4x 3 4 1 3x 2 7
3(3x + 2)(2x + 1)
Don’t forget the GCF 3 out front!

8. Quiz this Friday! Homework Due Monday! Do your homework!
Delta Math Week B WS
Factor Trinomial
Sorting Activity (Factoring)
Do your homework!
Quiz this Friday!

9. TOO (GCF FIRST!!!)