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Class VI
Class VII
Class VIII
Class IX
Class X
ICSE Grade VIII - Quadratic Equations
Question
1
1.
Solve :
(
x
+
6
)
(
x
+
4
)
+
(
x
−
5
)
(
x
−
4
)
=
61
33
(
8
,
(
-94
7
)
)
(
10
,
(
-66
5
)
)
(
6
,
-14
)
(
4
,
-14
)
(
7
,
(
-68
5
)
)
Question
2
2.
Find the roots of the quadratic equation
(
x
2
+
4
x
+
3
)
=
0
(
0
,
-3
)
(
-1
,
-3
)
(
0
,
-4
)
(
1
,
-5
)
(
1
,
-4
)
Question
3
3.
Solve :
5
(
x
−
2
)
−
2
(
x
−
5
)
=
−
5
(
x
+
3
)
(
47
16
√
5
+
5
16
√
105
)
,
(
47
16
√
5
−
5
16
√
105
)
(
47
16
+
5
16
√
105
)
,
(
47
16
−
5
16
√
105
)
(
47
16
+
5
16
√
210
)
,
(
47
16
−
5
16
√
210
)
(
47
16
+
5
16
√
315
)
,
(
47
16
−
5
16
√
315
)
(
47
16
√
4
+
5
16
√
105
)
,
(
47
16
√
4
−
5
16
√
105
)
Question
4
4.
Find the discriminant of the quadratic equation
(
x
2
+
2
x
)
=
0
6
4
3
2
5
Question
5
5.
Find the roots of the quadratic equation
(
21
x
2
−
23
x
+
6
)
=
0
(
4
3
,
1
7
)
(
4
3
,
3
5
)
(
2
5
,
3
5
)
(
2
5
,
3
7
)
(
2
3
,
3
7
)
Question
6
6.
Solve :
−
1
(
x
+
5
)
−
2
(
x
−
3
)
=
4
(
−
5
√
2
)
,
3
√
2
(
−
5
√
4
)
,
3
√
4
(
−
5
√
5
)
,
3
√
5
(
−
5
)
,
3
(
−
5
√
3
)
,
3
√
3
Question
7
7.
Solve :
9
x
2
−
3
a
b
x
−
2
a
2
b
2
= 0
−
a
b
9
,
4
a
b
3
−
5
a
b
9
,
0
−
3
a
b
11
,
2
a
b
5
−
3
a
b
7
,
2
a
b
−
a
b
3
,
2
a
b
3
Question
8
8.
Solve :
(
18
x
+
1
)
(
7
x
+
4
)
=
(
15
x
+
2
)
(
6
x
+
3
)
(
5
,
(
-1
3
)
)
(
-5
,
1
3
)
(
3
,
-1
)
(
4
,
-1
)
(
7
,
1
3
)
Question
9
9.
Solve the quadratic equation
x
−
2
=
48
x
(
8
,
-6
)
(
9
,
-7
)
(
9
,
-6
)
(
10
,
-8
)
(
10
,
-7
)
Question
10
10.
Find the roots of the quadratic equation
(
15
x
2
−
28
x
+
5
)
=
0
(
5
3
,
1
5
)
(
7
3
,
(
-1
5
)
)
(
7
5
,
1
3
)
(
7
3
,
1
3
)
(
7
5
,
1
5
)
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