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Class VI
Class VII
Class VIII
Class IX
Class X
ICSE Grade VIII - Quadratic Equations
Question
1
1.
Find the roots of the quadratic equation
(
16
x
2
−
4
)
=
0
(
1
4
,
-1
)
(
3
2
,
(
-3
2
)
)
(
3
2
,
-1
)
(
1
4
,
(
-1
2
)
)
(
1
2
,
(
-1
2
)
)
Question
2
2.
Solve the quadratic equation
x
+
8
x
=
−
6
(
-2
,
-4
)
(
-1
,
-5
)
(
1
,
-5
)
(
-1
,
-4
)
(
1
,
-6
)
Question
3
3.
Find the roots of the quadratic equation
(
x
2
+
7
x
+
6
)
=
0
(
-1
,
-6
)
(
1
,
-7
)
(
1
,
-8
)
(
0
,
-6
)
(
0
,
-7
)
Question
4
4.
Solve :
1
(
−
x
−
3
)
+
5
(
−
x
−
4
)
=
2
(
−
4
√
4
)
,
(
−
3
√
4
)
(
−
4
)
,
(
−
3
)
(
−
4
√
5
)
,
(
−
3
√
5
)
(
−
4
√
3
)
,
(
−
3
√
3
)
(
−
4
√
2
)
,
(
−
3
√
2
)
Question
5
5.
Solve :
−
2
(
−
x
+
2
)
+
5
(
−
x
−
4
)
=
−
5
(
x
−
1
)
(
−
31
4
√
5
+
5
4
√
57
)
,
(
−
31
4
√
5
−
5
4
√
57
)
(
−
31
4
+
5
4
√
57
)
,
(
−
31
4
−
5
4
√
57
)
(
−
31
4
√
4
+
5
4
√
57
)
,
(
−
31
4
√
4
−
5
4
√
57
)
(
−
31
4
+
5
4
√
171
)
,
(
−
31
4
−
5
4
√
171
)
(
−
31
4
+
5
4
√
114
)
,
(
−
31
4
−
5
4
√
114
)
Question
6
6.
Solve :
(
x
+
9
)
(
x
−
7
)
=
(
5
x
+
12
)
(
x
+
8
)
(
-1
,
15
)
(
3
,
-13
)
(
-6
,
10
)
(
-3
,
13
)
(
-4
,
12
)
Question
7
7.
Find the roots of the quadratic equation
(
x
2
−
6
x
+
9
)
=
0
(
4
,
3
)
(
5
,
1
)
(
4
,
2
)
(
5
,
2
)
(
3
,
3
)
Question
8
8.
Solve :
15
x
2
+
7
a
b
x
−
2
a
2
b
2
= 0
3
a
b
5
,
0
a
b
3
,
−
2
a
b
−
a
b
5
,
−
4
a
b
3
a
b
5
,
−
2
a
b
3
a
b
7
,
−
2
a
b
5
Question
9
9.
Find the discriminant of the quadratic equation
(
x
2
−
16
)
=
0
61
65
66
64
63
Question
10
10.
Find the roots of the quadratic equation
(
24
x
2
−
30
x
)
=
0
(
5
4
,
0
)
(
7
6
,
-1
)
(
7
6
,
0
)
(
7
4
,
-1
)
(
7
4
,
-3
)
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