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Practice Exam II
Math 031
Instructor: Hien Nguyen
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
Decide whether the ordered pair is a solution of the given system.
1) (-3, 1)
2x + y = -5
3x + 2y = -7
1)
A) Yes
B) No
Solve the system by elimination. If the system is inconsistent or has dependent equations, say so.
2)
2) 5x - 6y = 72
2x - 3y = 33
A) M; inconsistent system
B) {(6, -7)}
C) {(6, -6)}
D) {(5, -6)}
Apply the product rule for exponents, if possible.
3) (-3x5y)(-4x9y2)
A) 12x15y3
3)
B) 12x45y2
C) -12x14y2
D) 12x14y3
Evaluate the expression.
4) (-6)0 + (-10)0
A) -2
4)
B) -16
C) 2
D) 0
Write the expression with only positive exponents. Assume all variables represent nonzero numbers. Simplify if
necessary.
5)
5) (3p) -3
A)
1
27p3
B)
1
C)
9p-3
1
3p3
D)
1
-9p3
Apply the quotient rule for exponents, if applicable, and write the result using only positive exponents. Assume all
variables represent nonzero numbers.
x-14
6)
6)
x-2
A) -x16
B) x12
C)
1
x16
D)
1
x12
Simplify the expression so that no negative exponents appear in the final result. Assume all variables represent nonzero
numbers.
7)
7) (x-5y5)-2
A)
y3
x-7
B)
1
10
x y10
C)
x-7
y3
D)
x10
y10
Express the number in scientific notation.
8) .000819
A) 8.19 x 104
8)
B) 8.19 x 10-4
C) 8.19 x 10-5
1
D) 8.19 x 10-3
Add or subtract as indicated.
9) (-3x2 + 4x4 - 6 + 9x3) - (-7 - 2x3 + 7x4 - 7x2)
9)
A) -3x4 + 7x3 - 10x2 - 13
C) -3x4 + 11x3 + 4x2 + 1
B) 11x4 + 7x3 - 10x2 - 13
D) 11x4 + 7x3 - 10x2 + 1
Find the product.
10) -9x4(5x6 + 11x5)
A) -45x10 + 99x9
11) (x + 11)(-2x + 4)
A) -2x2 + 44x - 18
10)
B) -45x24 - 99x20
C) -45x10 - 99x9
11)
B) -2x2 - 18x + 44
C) -2x2 - 18x - 18
12) (-4x2 - 3y)(5x2 - 12y + z)
A) -20x4 + 33x2y - 4x2z + 36y2 - 3yz
14) (r - 4)2
A) r2 - 8r + 16
D) -2x 2 - 20x + 44
12)
B) -20x4 + 33x2y2 + 36y2
C) -20x2 + 33xy - 4x2z + 36y2 - 3z
13) (7p + 5)(7p - 5)
A) p2 - 25
D) -45x10 + 11x5
D) -20x4 + 33x2y + 36y4 - 4x2yz
13)
B) 49p2 + 70p - 25
C) 49p2 - 25
D) 49p2 - 70p - 25
B) r + 16
C) r2 + 16
D) 16r2 - 8r + 16
14)
Divide.
15)
-20x4 + 10x3 - 15x2
-5x3
A) 4x - 2
16)
15)
B) 4x - 2 +
3
x
D) 4x + 10x3 +
C) 7x - 2
x2 + 13x + 32
x+9
A) x + 5
16)
B) x + 4 -
4
x+9
C) x + 4 +
4
x+9
D)
x+4
x+9
Find the greatest common factor of the terms.
17) 15m5, 135m7, 225m6
A) 135m5
3
x
17)
B) 15m2
C) 15m5
D) 2025m2
Factor out the greatest common factor. Simplify the factors, if possible.
18) 108x7y6 - 96x2y4 - 60x4y2
A) 12x2y2(9x5y4 - 8y2 - 5x2)
C) x2y2(108x5y4 - 96y2 - 60x2)
18)
B) 12(9x7y6 - 8x2y4 - 5x4y2)
D) 12x2(9x5y6 - 8y4 - 5x2y2)
Factor by grouping.
19) 12a3 + 16a2b + 15ab2 + 20b3
19)
A) (4a2 + 5b)(3a + 4b)
C) (12a2 + 5b2)(a + 4b)
B) (4a2 - 5b2)(3a - 4b)
D) (4a2 + 5b2)(3a + 4b)
2
Factor the trinomial completely.
20) x2 + 3xy - 18y2
A) (x - y)(x + 3y)
20)
B) (x - 6y)(x + 3y)
C) (x - 6y)(x + y)
D) (x + 6y)(x - 3y)
21) -25x2 + 30x + 16
A) -(5x - 2)(5x - 8)
22) 3x3 + 6x2 - 24x
A) (x - 2)(3x2 + 12)
Factor the polynomial completely.
23) 9y4 - 25
A) (3y2 + 5)2
21)
B) -(5x + 2)(5x - 8)
C) (5x + 2)(5x + 8)
D) -(5x - 2)(5x + 8)
22)
B) 3x(x - 2)(x + 4)
C) (3x2 + 6x)(x - 4)
D) 3x(x + 2)(x - 4)
B) (9y2 + 1)(y2 - 25)
C) (3y2 + 5)(3y2 - 5)
D) (3y2 - 5)2
Factor the polynomial completely.
24) 9x2 - 42xy + 49y2
24)
A) (3x - 7y) 2
B) (3x - 7y)(3x + 7y)
D) (3x + 7y) 2
C) (9x + 1)(x + 49)
25) 512y3 - 343
25)
A) (8y + 7)(64y2 - 56y + 49)
C) (512y - 7)(y2 + 56y + 49)
B) (8y - 7)(64y2 + 56y + 49)
D) (8y - 7)(64y2 + 49)
26) 20x2 + 27x + 9
A) (20x + 1)(x + 9)
23)
26)
B) (20x + 3)(x + 3)
C) (4x - 3)(5x - 3)
D) (4x + 3)(5x + 3)
Solve the equation.
27) (4y + 5)(5y + 6) = 0
4
5
A) - , 1
6
27)
B)
5 6
,
4 5
C) -
5
6
,4
5
D) {1, 1}
Find all solutions by factoring.
28) 2x2 + 45 = x2 + 14x
A) 7, -9
28)
45
B)
,7
2
C) {9, 5}
45
D) { }
2
8
B) 7,
3
8
C) -7, 3
8
D) -7, - , 0
3
3 15
B)
,
7 32
7 5
C) - ,
,1
4 12
1
D)
,8
4
Solve the equation.
29) 3x3 + 29x2 + 56x = 0
8
A) 0, 7,
3
29)
Find all solutions by factoring.
30) (4x + 7)(x - 1) = 36x - 15
15
,1
A)
32
30)
3
Answer Key
Testname: PRACTICE EXAM II.TST
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A
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D
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A
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D
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B
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A
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B
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A
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A
B
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C
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D
1
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