February 29, 2016
Factoring Quadratic Trinomials
x2 + 4x - 21
*
Remember that the trinomial
comes from multiplying the
2 binomials using FOIL
FACTORING - - -
x2 + 4x - 21 = (
)(
)
?
Teach me how
to factor (video)
February 29, 2016
Homework Questions(Factoring Trinomials wkst)
February 29, 2016
Warm-Up
Factor :
2
1. x - x - 2
2
2. y + 7y - 30
3
3. 2d - 4d
2
4. -2x + 50
( x - 2) ( x + 1 )
(y + 10 ) ( y - 3 )
2d ( d2 - 2)
-2 ( x2 - 25 ) =
-2 ( x + 5 ) ( x - 5 )
February 29, 2016
Learning Target:
* I can factor a quadratic
2
trinomial ax + bx + c
when a = 1
Homework
Factoring
p.572 # Trinomials
25-47odda>1
(pick any #64,
10) 68, 71
challenge
Challenge: p.572 #64, 68, 71
February 29, 2016
8.4 "Hard" Factoring
2
x + bx + c
"Easy" Factoring: __________
like x2 + 2x – 15
ax2 + bx + c
"Hard" Factoring: __________
like 12x2 - 5x - 2
February 29, 2016
2
Factor: x - 16x + 15
2
Factor: 3x - 12x
2
Factor: 12x - 5x - 2
February 29, 2016
"Hard Factoring"
a
b
c
The Solution: The asterisk method
http://www.youtube.com/watch?v=DAGEgwoLl34&feature=channel
February 29, 2016
To Factor a quadratic trinomial if:
*
There is no GCF
*
It is not a Perfect
Square Trinomial
or
GCF has already
been factored out
* "a" is not "1"
S:
E
T
NO
February 29, 2016
S:
E
T
NO
February 29, 2016
S:
E
T
NO
February 29, 2016
S:
E
T
NO
February 29, 2016
February 29, 2016
S:
E
T
NO
February 29, 2016
S:
E
T
NO
February 29, 2016
S:
E
T
NO
February 29, 2016
S:
E
T
NO
Watch it again
http://www.youtube.com/watch?v=DAGEgwoLl34&feature=channel
February 29, 2016
Factor:
2
6x - x - 12
February 29, 2016
2
Factor: 12x - 3x - 9