Harford Community College – MATH 018 Spring 2009
Homework #7: 7.1 – 7.4
Due: 4/9/09
Directions: Solve each of the following problems on separate paper. Staple everything together
with your name on each sheet of paper and submit by the due date. Show work when necessary;
otherwise, the problem becomes all or nothing. Each problem will be scored on the 0, 1, 4,
4.5, 5 scale as detailed in the syllabus.
In 1) and 2), find where the rational expression is undefined:
1)
2
9
18
9
2
−
−
+
x
x
x 2)
x
x
x
x
44
15
11
23
2
+
−
−
3) Simplify:
x
x
3
2
49
2
−
−
In 4) – 6),
multiply
and
simplify
the rational expression –
leave NO negative exponents
:
4)
9
5
32
4
27
12
16
9
r
s
s
r
sr ⋅
5)
4
7
2
816
40
20
2
283
22
2
−
−
+
⋅
+
+
−+
x
x
x
x
x
xx
6)
54
2
54186
2
6
9
3
22
+
+−
⋅
−
−
x
xx
x
x
In 7) – 9),
divide
and
simplify
the rational expression:
7)
825
12
3
427
c
b
a
ba
c
b
cba ÷
8)
2
3
54
6
5
2510
2
2
2
2
+
+
−−
÷
+
+
+−
x
x
xx
x
x
xx
9)
12
3
4129
18
9
27
10116
2
2
2
2
+
+−
÷
−
+
−+
x
xx
x
x
xx
More on the other side →
