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CHAPTER2.7T
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à 2.7ïSimplifying algebraic expressions.
äïPlease combine like terms in the following expressions.
âS
êêêê 2x + 3x = 5x
êêê 4x - x + 3y + 6y = 3x + 9y
éS
Like terms are terms that have the same letters raised to the same
powers.ïAny like terms can be combined by adding their coefficients.
The terms 2xy and -5xy are like terms.ïThey can be combined to give
(2xy + (-5xy)) = (2 + (-5))xy = -3xy.ïThe common factor, xy, is taken
outside of the parençs using the distributive property.ïThe
coefficients 2 and -5 are then added to give a coefficient of -3 for the
answer.
1
êêêè 2x - 3x + 4x + 3 - 7
ë A)ï2x + 5êB) -3x + 4ë C) -6x - 7ë D)ï3x - 4
üêêë2x - 3x + 4x + 3 - 7
êêêè =(2 - 3 + 4)x + (3 - 7)
êêêè = (3)x + (-4)
êêêè = 3x - 4
Ç D
2
êêêè8 - 4z - 3z - 6 + z - 4z
ëA)ï7z - 4êB) -10z + 2ëC) 8z - 6êD) å of ç
üêêè 8 - 4z - 3z - 6 + z - 4z
êêêï=(-4z - 3z + z - 4z) + (8 - 6)
êêêï=(-4 - 3 + 1 - 4)z + (8 - 6)
êêêï=(-4 + (-3) + 1 + (-4))z + (8 + (-6))
êêêï= -10z + 2
Ç B
3êêë 1ë1ë5
êêêê ─∙x + ─∙x - ─ + 4
êêêê 3ë4ë2
êï7ë3êè2ë1êè 2ë1êïå
ëA) ──∙x + ─êB) ─∙x - ─ë C) - ─∙x + ─ë D)ïof
ê 12ë2êè7ë2êè 3ë2êïç
üë┌ 1è1 ┐è ┌ï5ë┐è┌ï4è 3 ┐è ┌ï5è8 ┐
êè │ ─ + ─ │x + │- ─ + 4 │ = │ ── + ── │x + │- ─ + ─ │
êè └ 3è4 ┘è └ï2ë┘è└ 12è12 ┘è └ï2è2 ┘
êêêè┌ï7 ┐è 3ë 7ë3
êêê = │ ── │x + ─ï=ï──∙x + ─
êêêè└ 12 ┘è 2ë12ë2
Ç A
4
#êêêè2aì + 3a - aì + 4a - 6 + 2
#A) 2aì - 7a + 4è B) aì + 7a - 4è C) 3aì - a + 8è D) å of ç
üêêêêè┌ê ┐
#ë 2aì + 3a - aì + 4a - 6 + 2ï=ï│2aì - aì│ + (3a + 4a) + (-6 + 2)
êêêêêï└ê ┘
#= (2 - 1)aì + (3 + 4)a + (-6 + 2)ï=ï(2 + (-1))aì + (3 + 4)a + (-6 + 2)
#êêêê = aì + 7a - 4
Ç B
5
êêêï-4.2k - 6.1 + 1.3k + 3.5
èA)ï4.1k + 3.2ëB) -k + 4.7ë C) -2.9k - 2.6èD) å of ç
ü
êêêï-4.2k - 6.1 + 1.3k + 3.5
êêêï=(-4.2 + 1.3)k + (-6.1 + 3.5)
êêêï=(-2.9)k + (-2.6)
êêêï= -2.9k - 2.6
Ç C
äïPlease clear parenthesis using the distributive property
êêand combine like terms.
â
êêêê2 + 4(3x + 1)
êêêë= 2 + 12x + 4
êêêë= 12x + (4 + 2)
êêêë= 12x + 6
éS
ïIn an expression like 3 - (x + 4), use the distributive property to
êè multiply the minus one through the parenthesis.
êêêêï3 - (x + 4)
êêêê= 3 + (-1)(x + 4)
êêêê= 3 + (-1)x + (-1)4
êêêè Then combine like terms.
êêêêï3 + (-x) + (-4)
êêêê= (-x) + (3 + (-4)
êêêê= -x + (-1)
êêêê= -x - 1
6
êêêê -4(2x - 3)
ëA) -8x + 12ë B) 8x - 12ë C) -8x - 12ëD) å of ç
ü
êêêê -4(2x - 3)
êêêë = -4(2x) + (-4)(-3)
êêêë = -8x + 12
Ç A
7
êêê -3(2y - 3) - (7 - y) + 3y - 7
ëA)ï2y - 5êB)ï-2y - 5ëC)ï-2y + 5ëD) å of ç
üêêï-3(2y - 3) - (7 - y) + 3y - 7
êêë = -6y + 9 - 7 + y + 3y - 7
êêë = (-6y + y + 3y) + (9 - 7 - 7)
êêë = (-6 + 1 + 3)y + (9 - 7 - 7)
êêë = -2y - 5
Ç B
8
êêêë 3.2(2x - 4) + 4.1
ïA) 6.4x - 8.7ëB) 3.2x - 8.7è C) -6.4x + 8.7è D) å of ç
ü
êêêë 3.2(2x - 4) + 4.1
êêêè = 6.4x - 12.8 + 4.1
êêêè = 6.4x - 8.7
Ç A