Factoring Polynomials Factoring Polynomials
Mar 27, 2015
Factoring PolynomialsFactoring Polynomials Factoring PolynomialsFactoring Polynomials
Example 1
Find factorizations of 6x2.
(1)(6x2)
(2)(3x2) (6)(x2) (1x)(6x)
(2x)(3x)
(-1)(-6x2)
(-2)(-3x2) (-3)(-2x2)
Example 2Factor.
a) 5x3 + 10
5( )
x3 + 2
b) 6x3 + 12x2
6x2( )x + 2
c) 12u3v2 + 16uv4
4uv2( )
3u2+ 4v2
PracticeFactor.
1) x2 + 3x
2) a2b + 2ab
Example 3Factor.
d) 18y4 – 6y3 + 12y2
e) 8x4y3 – 6x2y4
f) 5x3y4 + 7x2z3 + 3y2z
Example 3Factor.
d) 18y4 – 6y3 + 12y2
6y2( )3y2 - y
e) 8x4y3 – 6x2y4 2x2y3( )4x2 - 3y
f) 5x3y4 + 7x2z3 + 3y2z
+ 2
No common factors
PracticeFactor.
1) 3x6 – 5x3 + 2x2
2) 9x4 – 15x3 + 3x2
PracticeFactor.
3) 2p3q2 + p2q + pq4) 12m4n4 + 3m3n2 + 6m2n2
Factor by Grouping• When polynomials contain four terms,
it is sometimes easier to group like terms in order to factor.
• Your goal is to create a common factor.• You can also move terms around in the
polynomial to create a common factor.• Practice makes you better in
recognizing common factors.
Factoring Four Term Factoring Four Term PolynomialsPolynomials
Factoring Four Term Factoring Four Term PolynomialsPolynomials
Factor by Grouping
• FACTOR: 3xy - 21y + 5x – 35• Factor the first two terms: 3xy - 21y = 3y (x – 7)• Factor the last two terms: + 5x - 35 = 5 (x – 7)• The green parentheses are the same so
it’s the common factor
Now you have a common factor (x - 7) (3y + 5)
Factor by Grouping
• FACTOR: 6mx – 4m + 3rx – 2r• Factor the first two terms: 6mx – 4m = 2m (3x - 2)• Factor the last two terms: + 3rx – 2r = r (3x - 2)• The green parentheses are the same so
it’s the common factor Now you have a common factor
(3x - 2) (2m + r)
Factor by Grouping• FACTOR: 15x – 3xy + 4y –20• Factor the first two terms: 15x – 3xy = 3x (5 – y)• Factor the last two terms: + 4y –20 = 4 (y – 5)• The green parentheses are opposites so
change the sign on the 4 - 4 (-y + 5) or – 4 (5 - y)• Now you have a common factor (5 – y) (3x – 4)