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Class VI
Class VII
Class VIII
Class IX
Class X
ICSE Grade VIII - Quadratic Equations
Question
1
1.
Solve the quadratic equation
x
=
49
x
(
8
,
-7
)
(
8
,
-8
)
(
7
,
-7
)
(
10
,
-9
)
(
10
,
-8
)
Question
2
2.
Find the roots of the quadratic equation
(
21
x
2
−
x
−
10
)
=
0
(
5
9
,
(
-2
3
)
)
(
1
,
(
-4
3
)
)
(
5
9
,
-2
)
(
5
7
,
(
-2
3
)
)
(
1
,
-2
)
Question
3
3.
Find the roots of the quadratic equation
(
x
2
+
14
x
+
48
)
=
0
(
-5
,
-9
)
(
-4
,
-11
)
(
-4
,
-9
)
(
-6
,
-8
)
(
-5
,
-8
)
Question
4
4.
Solve :
−
3
(
x
−
2
)
+
4
(
−
x
+
5
)
=
−
4
x
(
−
5
6
√
5
+
1
6
√
505
)
,
(
−
5
6
√
5
−
1
6
√
505
)
(
−
5
6
+
1
6
√
1010
)
,
(
−
5
6
−
1
6
√
1010
)
(
−
5
6
√
4
+
1
6
√
505
)
,
(
−
5
6
√
4
−
1
6
√
505
)
(
−
5
6
+
1
6
√
505
)
,
(
−
5
6
−
1
6
√
505
)
(
−
5
6
+
1
6
√
1515
)
,
(
−
5
6
−
1
6
√
1515
)
Question
5
5.
Solve :
−
4
(
−
x
−
1
)
+
2
(
−
x
−
5
)
=
−
4
(
−
√
2
)
,
(
−
5
√
2
)
(
−
√
4
)
,
(
−
5
√
4
)
(
−
√
3
)
,
(
−
5
√
3
)
(
−
1
)
,
(
−
5
)
(
−
√
5
)
,
(
−
5
√
5
)
Question
6
6.
Find the roots of the quadratic equation
(
x
2
−
13
x
+
42
)
=
0
(
8
,
6
)
(
9
,
4
)
(
8
,
5
)
(
9
,
5
)
(
7
,
6
)
Question
7
7.
Solve :
(
x
−
1
)
(
5
x
+
4
)
=
(
x
+
3
)
(
9
x
+
2
)
(
-7
,
1
2
)
(
10
,
1
2
)
(
7
,
(
-1
2
)
)
(
6
,
-1
)
(
5
,
(
-3
2
)
)
Question
8
8.
Solve :
18
x
2
−
11
a
b
x
+
a
2
b
2
= 0
a
b
4
,
a
b
11
−
a
b
2
,
−
a
b
9
a
b
,
a
b
7
a
b
2
,
a
b
9
3
a
b
2
,
a
b
3
Question
9
9.
Solve :
(
x
−
2
)
(
x
+
2
)
+
(
x
−
3
)
(
2
x
+
3
)
=
53
91
(
6
,
(
-284
169
)
)
(
3
,
(
-284
167
)
)
(
4
,
(
-56
33
)
)
(
5
,
(
-282
167
)
)
(
8
,
(
-280
167
)
)
Question
10
10.
Find the roots of the quadratic equation
(
72
x
2
+
68
x
+
16
)
=
0
(
(
-4
11
)
,
(
-1
2
)
)
(
(
-2
9
)
,
(
-3
2
)
)
(
(
-4
9
)
,
(
-1
2
)
)
(
(
-2
9
)
,
-1
)
(
(
-4
11
)
,
-1
)
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