504
Chapter 9
Solving
Q
uadratic
E
quations
9.1
–9.3
Quiz
Simplify the expression.
(Section
9.1)
1.
√
—
112
x
3
2.
—
18
—
81
3.
3
√
—
625
4.
12
—
√
—
32
5.
4
—
√
—
11
6.
—
144
—
13
7.
3
—
54
x
4
—
343
y
6
8.
—
4
x
2
—
28
y
4
z
5
9.
6
—
5
+
√
—
3
10.
2
√
—
5
+
7
√
—
10
3
√
—
20
11.
10
—
√
—
8
√
—
10
12.
√
—
6
(
7
√
—
12
4
√
—
3
)
Use the graph to solve the equation.
(Section
9.2)
13.
x
2
2
x
3
0
14.
x
2
2
x
+
3
0
15.
x
2
+
10
x
+
25
0
246
x
y
2
3
5
2
y
x
2
2
x
3
246
x
y
2
2
6
y
x
2
2
x
+
3
x
y
2
4
6
8
2
2
4
6
8
22
44
66
88
y
x
2
+
10
x
+
25
Solve the equation by graphing.
(Section
9.2)
16.
x
2
+
9
x
+
14
0
17.
x
2
7
x
8
18.
x
+
4
x
2
Solve the equation using square
roots.
(Section
9.3)
19.
4
x
2
64
20.
3
x
2
+
6
10
21.
(
x
8)
2
1
22.
Explain how
to determine the number of real solutions of
x
2
100 without solving.
(Section 9.3)
23.
The length of a rectangular prism is four times its width. The v
olume of
the prism is 380 cubic meters. Find the length and width of the prism.
(Section 9.3)
24.
Y
ou cast a
shing lure into the w
ater from a height of 4 feet
aboveth
e water
.
The height
h
(in feet) of the
shing lure after
t
seconds can be modeled by the equation
h
16
t
2
+
24
t
+
4.
(Section 9.2)
a.
After ho
w man
y seconds does the
shing lure reach a height
of12 feet?
b.
After how
many seconds does the
shing
lure hit the water?
5 m
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