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CHAPTER4.7T
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124
à 4.7ïDivision by a monomial.
äïPlease divide each polynomial by the given monomial.
âS
#êï12xìêêï12xì- 4xè 12xìè(-4x)
êï───ï= 6xêè ────────ï= ───ï+ ─────ï=ï6x - 2
êè2xêêë 2xê 2xë2x
éS
To divide a monomial by a monomial, first reduce the coefficients.
êêêêêêêëm
# 12xìè 6∙xìêêêêêëaëm-n
───ï=ï────ëThen use the rule for exponents,ï─── = a
ï2xë xêêêêêê n
êêêêêêêè a
#êêêê6xì
#to simplify the variables.ï── = 6xìúî = 6x
êêêê x
To divide a binomial by a monomial first seperate the expression into
fractions, then treat each of the resulting terms as a monomial divided
by a monomial.
#ë12xì- 4xë12xì+ (-4x)è 12xìï(-4x)
ë────────ï=ï───────────ï= ─── + ─────ï= 6x + (-2) = 6x - 2
ê 2xêë2xêè2xè 2x
To divide a trinomial by a monomial, seperate the fraction into three
fractions and simplify each one individually.
#ï9xì- 27x + 3ë9xì+ (-27x) + 3ë9xìï(-27x)è 3êë 1
ï────────────ï=ï───────────────ï=ï── + ────── + ──ï=ï3x -9 + ─
ê3xêêï3xêë3xë3xë3xêë x
1
#êë12xìêë3xìêêë12xêèå
èDivideè────êïA) ──ë B) 3xë C) ───êD)ïof
êë 4xêêxêêê4êè ç
ü
#êêêêè12xì
êêêêè────ï=ï3x
êêêêè 4x
Ç B
2
#êë28bÄêë28bê 4bÄêêêå
èDivideè────êïA) ───ëB) ───ëC) 4bê D)ïof
#êë 7bìêë 7êèbìêêêç
ü
#êêêêè28bÄ
êêêêè────ï=ï4b
#êêêêè 7bì
Ç C
3
#êë36aÅbÄêêê 36aÄbê 4aÅbÄê å
#èDivideè─────ê A) 4aÄbëB) ─────ëC) ────ë D)ïof
#êë9abìêêêë9êè abìêïç
ü
#êêêê 36aÅbÄ
#êêêê ─────ï=ï4aÄb
#êêêêï9abì
Ç A
4
#êêëDivideï40mÅ- 24mì + 36mèbyï4m
#A)ï10mÄ+ 6m + 9ëB) 10mÄ- 6m + 9ëC) 10mÄ+ 4ëD) å of ç
ü
#êï40mÅ- 24mì+ 36më40mÅï(-24mì)è36m
#êï───────────────ï=ï─── + ─────── + ───ï=ï10mÄ- 6m + 9
êê 4mêë 4më 4më 4m
Ç B
5
#êêê Divideï3xì- 6x + 9èby 3x
êê3êêêêêêêå
#ïA)ïx - 2 + ─ê B) x - 2 + 3ê C) xì- 2x + 3ëD)ïof
êêxêêêêêêêç
ü
#êè 3xì- 6x + 9ê3xìè(-6x)è 9êê3
êè ───────────è =ï──ï+ ───── + ──è=ïx - 2 + ─
êêï3xêè 3xë 3xè 3xêêx
Ç A
6
#êêëDivideï-24bæ+ 8bÉ+ 4bÄ- 12bìè by 4bì
#A)ï-bÅ+ 3bÄ- 2b + 2ë B) -6bÅ+ 3bÄ+ b -2ë C) -6bÅ+ 2bÄ+ b - 3
ü
# -24bæ+ 8bÉ+ 4bÄ- 12bìè -24bæï8bÉè4bÄï(-12bì)
# ────────────────────ï=ï──── + ──ï+ ── + ──────ï=ï-6bÅ+ 2bÄ+ b - 3
#êï4bìêê 4bìè4bìè4bìè 4bì
Ç C
7
#êêëDivideï9xÅ- 27xÄ+ 3xëby 3xì
êê1êêê1êêêêïå
#A)ï3xì- 9x + ─ê B) 2xì+ 8x - ─ê C) 3xì+ 6x - 2bè D)ïof
êêxêêêxêêêêïç
ü
#êë9xÅ- 27xÄ+ 3xë9xÅï(-27xÄ)è3xêê 1
#êë─────────────ï=ï── + ─────── + ──ï=ï3xì- 9x + ─
#êêè3xìêè3xìè 3xìë3xìêêx
Ç A
8
#êêëDivideï4aÉ- 8aÅ+ 6aìëby -2aÄ
êê3êêë 3êêê 1êïå
#A) -2aì+ 4a - ─êB) 2aì- 4a + ─ê C) -2aì+ 8a + ─ë D)ïof
êêaêêë aêêê aêïç
ü
#ê 4aÉ- 8aÅ+ 6aìë 4aÉè(-8aÅ)è6aìêêè 3
#ê ────────────è=è─── + ────── + ───è=è-2aì+ 4a - ─
#êë-2aÄêè -2aÄè-2aÄè -2aÄêêèa
Ç A