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Class VI
Class VII
Class VIII
Class IX
Class X
ICSE Grade VIII - Quadratic Equations
Question
1
1.
Solve :
9
x
2
+
12
a
b
x
+
4
a
2
b
2
= 0
−
6
a
b
11
,
−
2
a
b
5
−
2
a
b
3
,
−
2
a
b
3
−
4
a
b
9
,
0
−
8
a
b
9
,
−
4
a
b
3
−
6
a
b
7
,
−
2
a
b
Question
2
2.
Solve :
−
5
(
−
x
−
2
)
−
3
(
x
−
1
)
=
5
(
x
−
2
)
4
3
√
4
,
(
−
8
√
4
)
4
3
√
5
,
(
−
8
√
5
)
4
3
√
2
,
(
−
8
√
2
)
4
3
,
(
−
8
)
4
3
√
3
,
(
−
8
√
3
)
Question
3
3.
Solve the quadratic equation
x
−
45
x
=
−
4
(
7
,
-10
)
(
6
,
-10
)
(
7
,
-12
)
(
6
,
-9
)
(
5
,
-9
)
Question
4
4.
Find the discriminant of the quadratic equation
(
x
2
−
2
x
)
=
0
2
3
6
5
4
Question
5
5.
Find the roots of the quadratic equation
(
30
x
2
+
x
−
20
)
=
0
(
6
5
,
(
-7
6
)
)
(
6
5
,
(
-5
4
)
)
(
4
7
,
(
-5
4
)
)
(
4
7
,
(
-5
6
)
)
(
4
5
,
(
-5
6
)
)
Question
6
6.
Solve :
−
5
(
−
x
+
3
)
−
2
(
x
+
4
)
=
4
3
√
3
,
(
−
4
√
3
)
3
√
2
,
(
−
4
√
2
)
3
,
(
−
4
)
3
√
4
,
(
−
4
√
4
)
3
√
5
,
(
−
4
√
5
)
Question
7
7.
Find the roots of the quadratic equation
(
72
x
2
+
4
x
−
20
)
=
0
(
1
4
,
(
-5
7
)
)
(
1
4
,
(
-5
9
)
)
(
1
2
,
(
-5
9
)
)
(
3
2
,
(
-7
9
)
)
(
3
2
,
(
-5
7
)
)
Question
8
8.
Find the roots of the quadratic equation
(
x
2
−
6
x
+
5
)
=
0
(
8
,
0
)
(
6
,
0
)
(
5
,
1
)
(
8
,
-2
)
(
6
,
1
)
Question
9
9.
Find the roots of the quadratic equation
(
x
2
+
6
x
+
8
)
=
0
(
0
,
-6
)
(
-2
,
-4
)
(
0
,
-5
)
(
-1
,
-4
)
(
-1
,
-5
)
Question
10
10.
Solve :
(
7
x
+
6
)
(
4
x
+
5
)
=
(
9
x
+
2
)
(
5
x
+
4
)
(
2
,
-7
)
(
-3
,
6
)
(
1
,
10
)
(
-5
,
5
)
(
-2
,
7
)
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