home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Multimedia Algebra
/
Algebra1.iso
/
ALGEBRA1
/
CHAPTER4.6T
< prev
next >
Wrap
Text File
|
1994-02-15
|
2KB
|
126 lines
124
à 4.6ïSpecial Products
äïPlease find each product.
âS
#êêè (b+3)(b-4) = bì-4b+3b-12 = bì-b-12
#êê(a+3)ì = (a+3)(a+3) = aì+3a+3a+9 = aì+6a+9
éS
In order to find the product of two binomials, multiply the first terms
in each group of parençs, the outer terms, the inner terms, and the
last terms in each group of parençs.
êêêê (a + b)(c + d)
êêêè = a∙c + a∙d + b∙c + b∙d
This method is called the "foil" method.
êêêê(b + 3)(b - 4)
êêê = b∙b + b(-4) + 3∙b + 3(-4)
The terms are simplified and like terms are combined.
#êêè = bì- 4b + 3b - 12è =è bì- b - 12
1
êêêMultiplyï(2x - 3)(x + 4)
êêêêêêêêêèå
#A)ï2xì+ 5x - 12ë B)ïxì+ 2x - 6ë C)ï3xì- 2x - 6ë D)ïof
êêêêêêêêêèç
üêêêï(2x - 3)(x + 4)
êêê = 2x∙x + 2x∙4 + (-3)x + (-3)4
#êêêë= 2xì+ 8x - 3x - 12
#êêêë= 2xì+ 5x - 12
Ç A
2
êêêMultiplyï(-2 + 5y)(4 - 6y)
êêêêêêêêêèå
#A) -4 + 3y + 12yìëB) -8 + 16y - 15yìïC) -8 + 32y - 30yìèD)ïof
êêêêêêêêêèç
üêêê(-2 + 5y)(4 - 6y)
êê = (-2)4 + (-2)(-6y) + (5y)4 + (5y)(-6y)
#êêêè = -8 + 12y + 20y - 30yì
#êêêê-8 + 32y - 30yì
Ç C
3
#êêêë Multiplyï(x + 6)ì
êêêêêêêêë å
#A) xì+ 12x + 12ëB) xì+ 12x + 36ëC) xì+ 6x + 16ëD)ïof
êêêêêêêêë ç
ü
#êêêêè (x + 6)ì
êêêë = (x + 6)(x + 6)
#êêêë= xì+ 6x + 6x + 36
#êêêê= xì+ 12x + 36
Ç B
4
#êêêë Multiplyï(8b - 2y)ì
êêêêêêêêêèå
#A) 64bì- 32by + 4yìè B) 8bì- 4yìêC) 4bì+ 16by - 8yìè D)ïof
êêêêêêêêêïç
ü
#êêêêè(8b - 2y)ì
êêêè = (8b - 2y)(8b - 2y)
êê = 8b(8b) + 8b(-2y) + (-2y)(8b) + (-2y)(-2y)
#êêêë= 64bì- 16by - 16by + 4yì
#êêêê= 64bì- 32by + 4yì
Ç A
5
êêêMultiplyï(a + 2)(a - 2)
êêêêêêêêêèå
#A) aì- 6a + 4êïB) aì- 4êëC) aì+ 6a - 4ê D)ïof
êêêêêêêêêèç
üêêêï(a + 2)(a - 2)
êêê= a∙a + a(-2) + 2∙a + 2(-2)
#êêêë = aì- 2a + 2a - 4
#êêêêè= aì- 4
Ç B
6
êêêMultiplyï(3x + 4)(3x - 4)
êêêêêêêêêèå
#A) 9xì- 16êëB) 9xì+ 4x - 16ëC) 9xì+ 8x + 16ë D)ïof
êêêêêêêêêèç
üêêêï(3x + 4)(3x - 4)
êêê= 3x(3x) + 3x(-4) + 4(3x) + 4(-4)
#êêêè = 9xì- 12x + 12x - 16
#êêêêè= 9xì- 16
Ç A
7êê ┌ë2 ┐è┌ë2 ┐
êê Multiply │2b - ─ │ ∙ │2b + ─ │
êêêè└ë3 ┘è└ë3 ┘
êê 2êêë4êê 4
# A) 4bì - 6b + ─ë B) bì - 8b + ─ëC) 4bì - ─ëD) å of ç
êê 3êêë9êê 9
üêêè ┌ë2 ┐è┌ë2 ┐
êêêè│2b - ─ │ ∙ │2b + ─ │
êêêè└ë3 ┘è└ë3 ┘
êêêêï2è┌ï2 ┐êï┌ï2 ┐ ┌ 2 ┐
êè = (2b)(2b) + (2b)∙ ─ + │- ─ │∙(2b) +ï│- ─ │∙│ ─ │
êêêêï3è└ï3 ┘êï└ï3 ┘ └ 3 ┘
êêêë 4è 4è 4êê 4
#êêë= 4bì + ─b - ─b - ─è =è 4bì - ─
êêêë 3è 3è 9êê 9
Ç C