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Warmup. Find the GCF for #1. Factor #s 2-4. 1. 2. 3. 4. Homework Questions?. Pg. 579. 10-3 Factoring Trinomials. Objective: To identify a prime trinomial and to factor a trinomial completely. Standard 11.0. Example 1. 1 st • 3 rd. Factor out the GCF first!. Factor completely. - PowerPoint PPT Presentation
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Warmup
Find the GCF for #1. Factor #s 2-4.
1.
2.
3.
4
2 2 2 342a bc ; 28ab c
2x 17x 16
2x x – 56
5ab 10a 4b 8
Homework Questions?
Pg. 579
10-3 Factoring Trinomials
Objective: To identify a prime trinomial and to factor a trinomial
completely.
Standard 11.0
Example 1
Factor completely.
18x2 + 21x + 6
3(6x2 + 7x + 2)12
7
3 46x2
2
3x
4x
3x
2x 1
2
3(3x + 2)(2x + 1)
1st•3rd
2nd
Pick 2 #s that multiply to get the top and add to get the bottom.
Those go on the sides of the X.Don’t forget the 3 out front!
Factor out the GCF first!
LTT (Let’s try together)
25 40 80g g
224 24 18x y xy y
5( 4)( 4)g g
6 (2 1)(2 3)y x x
TOO (hint: factor out the GCF first)
4 3 215 34 15m m m
2 (5 3)(3 5)m m m
Class Challenge
What about this?...
#36 on tonight’s homework:
23 3 5c c
-15
-3
? ?
There are no numbers that multiply to get -15 and add to get -3…
So you write PRIME
Homework
Pg. 579 # 36, 38-45
Do your homework!
Helpful X hints… (again)
+
+
+ +
+
-
- -
-
+
+ big - small
-
-
- big + small
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