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CHAPTER2.4T
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à 2.4ïThe multiplication operation.
äïPlease perform the following multiplication operations.
âS
êêêê (4)(5) = 20
êêêê(-3)(4) = -12
êêêë (-2)(-7) = 14
êêêê(6)(-5) = -30
éS
ïTo multiply two numbers with the same sign, just multiply them and
ïattach a plus sign to the product.
êêêê (3)(5) = 15
êêêê (-4)(-3) = 12
ïTo multiply two numbers with unlike signs, multiply the two numbers
ïand attach a minus sign.
êêêê (4)(-2) = -8
êêêê (-3)(6) = -18
1
êêêêè (6)(8)
êêèA) -48ëB) 14ëC) 48ëD) -14
ü
êêêê (6)(8) = 48
Ç C
2
êêêêè (-7)(4)
êêëA) 28ë B) 11ëC) -3ëD) -28
üêêê (-7)(4) = -28
Ç D
3
êè ┌ï2 ┐┌è9 ┐êï3ê11ê18êï11
êè │- ─ ││- ── │ë A) ─è B) ──è C) ──è D) - ──
êè └ï3 ┘└ï14 ┘êï7ê17ê47êï17
ü
êè ┌ï2 ┐┌è9 ┐ë┌ 2 ┐┌ï9 ┐ë┌ 1 ┐┌ 3 ┐ë3
êè │- ─ ││- ── │ï=ï│ ─ ││ ── │ï=ï│ ─ ││ ─ │ï=ï─
êè └ï3 ┘└ï14 ┘ë└ 3 ┘└ 14 ┘ë└ 1 ┘└ 7 ┘ë7
Ç A
4
êêêê(6 - 8)∙(4 + 3)
êêè A) 6êB) -14è C) -24è D) 17
ü
ê(6 - 8)∙(4 + 3)ï=ï(6 + (-8))∙(4 + 3)ï=ï(-2)∙(7)ï=ï-14
Ç B
5
êêêë(-6 - 5)∙(-3) + 7
êêè A) -6ë B) 13ëC) -12è D) 40
üêêê(-6 - 5)∙(-3) + 7
êêêë = (-6 + (-5))∙(-3) + 7
êêêë = (-11)∙(-3) + 7
êêêë = 33 + 7
êêêë = 40
Ç D
6
êêêêï6(-4) - (-8)
êêè A) 12ë B) -16è C) -8ëD) 16
ü
êè6(-4) - (-8)ï=ï(-24) - (-8)ï=ï(-24) + (8)ï=ï-16
Ç B
7
êêêè (-8 - 3)(-4) - (-7)
êêè A) -42ëB) 17ëC) -23è D) 51
üêêê(-8 - 3)(-4) - (-7)
êêêè = (-8 + (-3))(-4) - (-7)
êêêè = (-11)(-4) - (-7)
êêêè = 44 - (-7)
êêêè = 44 + (7)
êêêè = 51
Ç D
äïPlease evaluate the following expressions if x = 3,
êêy = -5, and z = 7.
âêêêï(z - y) + x
êêêê= (7 - (-5)) + 3
êêêê= (7 + (5)) + 3
êêêê= (12) + 3
êêêê= 15
éS
è To evaluate an expression like 2x - 3y if x = 3 and y = -5, just
è substitute the numbers in for the letters and simplify.
êêêêè2x - 3y
êêêê = 2(3) - 3(-5)
êêêê = 6 -(-15)
êêêê = 6 + 15
êêêê = 21
8
êêêê 2x - (y + z)
êêèA) 8êB) -6êC) 4êD) 12
üêêêè2x - (y + z)
êêêê= 2(3) - (-5 + 7)
êêêê= 6 - (2)
êêêê= 6 + (-2)
êêêê= 4
Ç C
9
êêêê(x - y)(2z - y)
êê A) 129ëB) 86êC) 152ëD) -86
üêêê (x - y)(2z - y)
êêêë= (3 - (-5))(2∙7 - (-5))
êêêë= (3 + 5)(14 + (5))
êêêë= (8)(19)
êêêë= 152
Ç C
10
êêêêï2(x + z) -21
êê A) -1ë B) 2ê C) 23ë D) 42
üêêêè2(x + z) - 21
êêêê= 2(3 + 7) = 21
êêêê= 2(10) -21
êêêê= 20 -21
êêêê= -1
Ç A
äïPlease express the folowing written phrases as numerical
êêexpressions and perform the operations.
âè The product of eight and the difference between negative
êêêë seven and four.
êêêêï8(-7 - 4)
êêêê= 8(-7 + (-4)
êêêê= 8(-11)
êêêê= -88
éS
ïPhrases such as "times", "the product of", "twice", and "percent of"
ïindicate the multiplication operation.
11
êè eight subtracted from the product of negative five and
êêêêè fourteen
êêA) -78êB) 46êC) 84êD) -68
ü
êêêê(-5)(14) - 8
êêêê= (-70) - 8
êêêê= -70 + (-8)
êêêê= -78
Ç A
12è twice the difference between negative six and
êêêë negative fifteen
êêêêêê27êë12
êêA) -27êB) 18êC) ──êD) - ──
êêêêêê 4êë15
ü
êêêêï2(-6 - (-15)
êêêêï= 2(-6 + 15)
êêêêï= 2(9)
êêêêï= 18
Ç B