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CHAPTER2.6T
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à 2.6ïProperties of the Real Numbers
äïPlease justify the following statements by referring to
êêthe appropriate addition property.
âS
ê2 + (3 + 4) = (2 + 3) + 4èassociative property of addition
ê5 + 0 = 5êêëadditive identity
éS
ïThe five addition properties are described as follows:
ï1.ïa + b is a real numberêïclosure property of addition
ï2.ïa + (b + c) = (a + b) + cë associative property of addition
ï3.ïa + b = b + aêêè commutative property of addition
ï4.ïa + 0 = aêêê additive identity property
ï5.ïa + (-a) = 0êêëadditive inverse property
ïThe closure property of addition says that if you add any two real
ïnumbers, you get a real number as the answer.
1
êêêê 3 + 4 = 4 + 3
A) additive inverseêêè B) commutative property of addition
C) associative property of additionïD) none of ç
ü
êêë commutative property of addition
Ç B
2
êêêêï4 + (-4) = 0
A) additive inverseêêè B) commutative property of addition
C) additive identityêêèD) none of ç
ü
êêêë additive inverse
Ç A
3
êêêï4 + (6 + 8) = (4 + 6) + 8
A) closure property of additionë B) commutative property of addition
C) associative property of additionïD) none of ç
ü
êêë associative property of addition
Ç C
4
êêêè5 + (-6) is a real number
A) additive inverseêêè B) closure property of addition
C) additive identityêêèD) none of ç
ü
êêê closure property of addition
Ç B
5
êêêê 0 + (-7) = -7
A) additive inverseêêè B) commutative property of addition
C) additive identityêêèD) none of ç
ü
êêêë additive identity
Ç C
äïPlease justify the following statements by referring to
êêthe appropriate multiplication property.
âS
êêê 1
êêè 4 ∙ ─ = 1èmultiplicative inverse
êêê 4
êêè 5 ∙ 1 = 5èmultiplicative identity
éS
ïThe five multiplication properties are described as follows:
ï1.ïa∙b is a real numberèclosure property of multiplication
ï2.ïa(b∙c) = (a∙b)cê associative property of multiplication
ï3.ïa∙b = b∙aêêcommutative property of multiplication
ï4.ïa∙1 = aêêïmultiplicative identity
ê 1
ï5.ïa∙─ = 1êêïmultiplicative inverse
ê a
6
êêêï2 ∙ (3 ∙ 6) = (2 ∙ 3) ∙ 6
A) closure property of multiplicationêB) multiplicative inverse
C) associative property of multiplicationèD) none of ç
ü
êêè associative property of multiplication
Ç C
7êêê 1
êêêêè─ ∙ 3 = 1
êêêêè3
A) multiplicative identityêêè B) multiplicative inverse
C) associative property of multiplicationèD) none of ç
ü
êêêè multiplicative inverse
Ç B
8
êêêêè1 ∙ 6 = 6
A) multiplicative identityêêè B) multiplicative inverse
C) associative property of multiplicationèD) none of ç
ü
êêêèmultiplicative identity
Ç A
äïPlease justify the following statements with either the
additive and multiplicative properties, or the distributive property.
â
êêêè3(2 - 3x) = 3∙2 - 3(3x)
éS
êêêïThe distributive property:
êêêè a(b + c) = a∙b + a∙c
9êë 2è┌ï1 ┐ê1è┌ 2 ┐
êêê ─ ∙ │- ─ │ï=ï- ─ ∙ │ ─ │
êêê 3è└ï4 ┘ê4è└ 3 ┘
A) commutative property of multiplicationèB) additive identity
C) closure property of multiplicationêD) none of ç
ü
êêïcommutative property of multiplication
Ç A
10
êêêè6(4 - 3x) = 6∙4 - 6(3x)
A) additive identityêêêèB) multiplicative inverse
C) distributive propertyêêë D) none of ç
ü
êêêëdistributive property
Ç C
11
êêêë 2 + 3∙4 = 2 + 4∙3
A) commutative property of multiplicationèB) multiplicative inverse
C) associative property of additionêïD) none of ç
ü
êêècommutative property of multiplication
Ç A
äïPlease use the distributive property to rewrite the
êêfollowing expressions.
âS
êêêï2(x + 4),ê2x + 8
êêêï4x - 8,êï4(x - 2)
éS
èThe distributive property can be used to multiply problems such as
êêï6(2x - 3)ï=ï6(2x) - 6(3)ï=ï12x - 18.
ë This property can also be used to factor problems such as
êêêê2x + 4 = 2(x + 2).
12
êêêêï5(3a + 4b)
A)ï8a + abêB)ï15a + 20bêC)ï15a + 4bëD) å of ç
ü
êê 5(3a + 4b)ï=ï5(3a) + 5(4b)ï=ï15a + 20b
Ç B
13
êêêêè18x - 8y
A)ï8(10x - y)è B)ï3x - 4yêïC)ï2(9x - 4y)èD) å of ç
ü
êê 18x - 8yï=ï2(9x) - 2(4y)ï=ï2(9x - 4y)
Ç C
14
êêêêï-(-2 - 9x)
A)ï2 + 9xê B)ï-2 + 9xêïC)ï2 - 9xêD) å of ç
ü
êê -(-2 - 9x)ï=ï-(-2) + (-(-9x))ï=ï2 + 9x
Ç A