Ch 8 Exam Review Note: These are only a sample of the types of

Ch 8 Exam Review
Note: These are only a sample of the types of problems that may appear on the exam. Anything covered in class can appear on
the exam.
List all numbers for which the rational expression undefined.
8
1)
b+9
x2 - 49
2)
2
x + 9x + 20
Simplify, if possible.
9x + 54
3)
9x - 54
4)
5)
6)
m 2 - 8m + 16
15)
x3 + 27
x2 - 9
÷
3
2
x - 27 x + 3x + 9
18)
x7 + 5x4 - x3 - 5
7)
x3 - x5 + 5 - 5x2
2x + 3
x+1
2
2
x + 3x + 2 x + 3x + 2
Find the LCM.
19) 21, 28
Multiply. Leave the answer in factored form.
5x x - 5
·
8)
2 x+1
20) m 2 + 2 m, m2 + 5 m + 6
Multiply and, if possible, simplify.
x-6
x2 - 2x - 24
·
9)
(x + 4)2
(x - 6)2
x2 + 2x - 8 25x3 - 9x
·
6x - 12
5x3 - 3x2
z 2 + 15 z + 54
z2 + 6 z
÷
z 2 + 16 z + 63 z 2 + 4 z - 21
Perform the indicated operation. Simplify, if possible.
5m
-20
+
17)
m-4 m-4
2-m
m-2
11)
14)
3x2 - 14xy - 5y2
15x2 + 2xy - y2
x2 - 2x - 35
x2 + 2x - 63
k2 + 6k + 8
k2 + 8k
·
k2 + 10k + 16 k2 + 6k + 8
x2 - 4
x-2
÷
2
1
- 3x
9x - 1
Simplify, if possible.
5x2 - 24xy - 5y2 y2 + 2xy - 3x2
·
÷
16)
y2 + 4xy - 5x2
15x2 + 8xy + y2
m 2 - 16
10)
13)
Perform the indicated operation. Simplify, if possible.
1
7
21) - 7 5x
22)
6
9
+
r
r- 4
23)
4x
3
+
x+5 x-5
24)
Divide and, if possible, simplify.
2x2 x3
÷
12)
3
15
25)
1
3x
x2 - 5x + 6
8
m - n2
+
-
12
x2 - 6x + 8
3
2
n -m
26)
5(y - 1)
y- 5
6y
3y - 8
8 - 3y 3y - 8
Simplify.
27)
28)
1+
3
4
1+
1
12
x+
9
x
x+
x
9
Solve. If no solution exists, state this.
7
3
x
=
29) 9 11 33
30)
6
2
=5 +
x
x
31)
5
3
=
x+6 x-1
32)
x + 2 x - 10
=
x-4
x+5
33)
34)
1
x2 - 5x + 6
+
2
x2 + 2x - 8
=
3
x 2 + 5x + 4
x
-7
=
x+7 x+7
2
Answer Key
Testname: CH 8 EXAM REVIEW
1) -9
2) -5, -4
x+6
3)
x-6
4)
m+4
m-4
5)
x+5
x+9
6) -1
7) -(x2 + 1)
5x(x - 5)
8)
2(x + 1)
9)
1
x+4
10)
k
k+ 2
11)
(x + 4)(5x + 3)
6x
12)
10
x
13) -
x+2
3x + 1
14)
z -3
z
15)
x2 - 3x + 9
(x - 3)2
16)
5x - y
5x + y
17) 5
18)
1
x+1
19) 84
20) m(m + 2 )(m + 3 )
-5x - 49
21)
35x
22)
15 r - 24
r(r - 4 )
23)
4x2 - 17x + 15
x2 - 25
24)
3(x - 6)
(x - 3)(x - 4)
25)
5
m - n2
26)
-10
3y - 8
27)
21
13
3
Answer Key
Testname: CH 8 EXAM REVIEW
28)
9x2 + 81
10x2
29)
50
3
30)
4
5
31)
23
2
32)
10
7
33)
5
4
34) No solution
4