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CHAPTER4.5T
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à 4.5ïProducts of polynomials.
äïPlease find the following products.
âS
# (2bì)(-3bÉ) = -6bÆ,êï3y(6-4yì) = 3y(6) + 3y(-4yì) = 18y - 12yÄ
éS
To multiply a monomial times a monomial, use the commutative and
associative properties of multiplication to group the numerical factors
and the variable factors in seperate parençs.
#êêë(2bì)(-3bÉ)ï=ï(2)(-3)(bì∙bÉ)
Then use the rules for multiplying signed numbers to multiply the
êêêêêèmïnèm+n
numerical factors, and use the rule, a ∙a = aè, to multiply the
#variables.êêï= (-6)bìóÉ = -6bÆ
#To multiply 3y(6 - 4yì ), first use the distributive property to obtain,
#êêêë(3y)(6) + (3y)(-4yì)
then treat each term of this expression as a monomial times a monomial.
#êêêêè18y - 12yÄ
1
#êêë Find the productï(14aÄ)(-2aÉ).
#A)ï12aìêëB)ï-28aôêïC)ï26aúìê D)ïå of ç
ü
#êè(14aÄ)(-2aÉ) = (14)(-2)(aÄ∙aÉ)ï=ï-28aÄóÉï=ï-28aô
Ç B
2
#êêë Find the productï(-5xÆ)(-3xÅ).
#A)ï15xîîêè B)ï-15xÄêïC)ï-15úìê D)ïå of ç
ü
#êè(-5xÆ)(-3xÅ) = (-5)(-3)(xÆ∙xÅ)ï=è15xÆóÅï=è15xîî
Ç A
3
êêë Find the productï2z(4z + 2)
#A)ï16z + 4êïB)ï8z + 4ê C)ï8zì+ 4zë D)ïå of ç
ü
#êê2z(4z + 2)ï=ï(2z)(4z) + (2z)(2)ï=ï8zì + 4z
Ç C
4
êêë Find the product -5p(5 - 4p) .
#A) -25p + 4pìêB) -25p + 20pìè C) -25pì- 20pìè D)ïå of thes
ü
#êè -5p(5 - 4p)ï=ï(-5p)(5) + (-5p)(-4p)ï=ï-25p + 20pì
Ç B
äïMultiply the following binomials.
âê(2x + 3)(x - 1)ï=ï(2x + 3)∙x + (2x + 3)(-1)
êêè=ï(2x)x + 3x + (2x)(-1) + 3(-1)
#êêï= 2xì + 3x - 2x - 3ï=ï2xì + x - 3
éS
To multiply two binomials such as (2x + 3) and (x - 1), use the
distributive property to multiply (2x + 3) times each term in the second
parençs.
êêêë (2x + 3)(x - 1)
êêêè = (2x + 3)∙x + (2x + 3)(-1)
Then use the distributive property again.
êêë = (2x)(x) + 3∙x + 2x(-1) + 3(-1)
Finally, simplify each term and combine like terms.
#êêë = 2xì+ 3x - 2x - 3ï=ï2xì+ x - 3
5
êêêïMultiplyï(x + 3)(3x - 4)
#A) 3xì+ 5x - 12è B) 2xì- 12x + 5è C) xì- 5x + 12è D) å of ç
üêêê (x + 3)(3x - 4)
ë= (x + 3)3x + (x + 3)(-4)è =è x∙3x + 3∙3x + x(-4) + 3(-4)
#êêï= 3xì+ 9x - 4x - 12è =è 3xì+ 5x - 12
Ç A
6
êêêïMultiplyï(4y - 2x)(5y + x)
#A) 10yì- 6xy + xìè B) xì- 4xy + yìëC) 20yì- 6xy - 2xìëD)ïof
êêêêêêêêêè ç
üêêê (4y - 2x)(5y + x)
= 14y - 2x)(5y) + (4y - 2x)∙xï=ï4y(5y) + (-2x)(5y) + (4y)(x) + (-2x)∙x
#êë =ï20yì- 10xy + 4xy - 2xìï=ï20yì- 6xy - 2xì
Ç C
7
#êêêëMultiplyï(m - 3)ì
êêêêêêêêêè å
#A) mì- 6m + 9êïB) mì- 9êë C) mì+ 9êë D)ïof
êêêêêêêêêè ç
ü
#êêêêè (m - 3)ì
êë= (m - 3)(m - 3)è=è (m - 3)m + (m - 3)(-3)
#êêï= mì- 3m - 3m + 9ë=ëmì- 6m + 9
Ç A
8
#êêêëMultiplyï(p + 2)Ä
êêêêêêêêêèå
#A) pÄ+ 8êëB) pÄ+ 6pì+ 12p + 8êC) pÄ- 8êïD)ïof
êêêêêêêêêèç
ü
#êêêêè (p + 2)Ä
êêêè= (p + 2)(p + 2)(p + 2)
#ê = (pì+ 4p + 4)(p + 2)è=èpÄ+ 4pì+ 4p + 2pì+ 8p + 8
#êêêë= pÄ+ 6pì+ 12p + 8
Ç B
äïMultiply the following expressions.
â
#êêêè (x + 3)(xì- 2x + 3)
#êë= xÄ- 2xì+ 3x + 3xì- 6x + 9è =è xÄ+ xì- 3x + 9
éS
#To multiply an expression such asè (x + 3)(xì- 2x + 3) just multiply
each term in the first group of parençs times each term in the second
group of parençs.
#êêï(x)(xì) + x(-2x) + x∙3 + 3∙xì+ 3(-2x) + 3∙3
#Then simplify individual terms.è xÄ- 2xì+ 3x + 3xì- 6x + 9
#Finally, collect like terms.êxÄ+ xì- 3x + 9
9
#êêêMultiplyï(2x - 3)(xì+ 3x - 5)
êêêêêêêêêëå
#A) 3xì+6xêB) 8xÄ- 3xì+ x - 5ë C) 2xÄ+ 3xì- 19x + 15ëD) of
êêêêêêêêêëç
ü
#êêêë (2x - 3)(xì+ 3x - 5)
#ë= (2x)(xì) + (2x)(3x) + (2x)(-5) + (-3)xì+ (-3)(3x) + (-3)(-5)
#ê= 2xÄ+ 6xì- 10x - 3xì- 9x + 15ë=ë2xÄ+ 3xì- 19x + 15
Ç C
10
#êêêMultiplyï(a + 4)(aÅ- 3aì+ 1)
êêêêêêêêêè å
#A) aÉ- 6ê B) aÄ- 3aì+ 9êè C) aÅ- 6aì+ 12êè D) of
êêêêêêêêêè ç
ü
#êêêè(a + 4)(aÅ- 3aì+ 1)
#êê= a∙aÅ+ a(-3aì) + a∙1 + 4∙aÅ+ 4(-3aì) + 4∙1
#ë = aÉ- 3aÄ+ a + 4aÅ- 12aì+ 4è=èaÉ+ 4aÅ-3aÄ- 12aì+ a + 4
Ç D