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)

+

+

+ +

+

-

- -

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+

+ big - small

-

-

- big + small