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Class VI
Class VII
Class VIII
Class IX
Class X
ICSE Grade VIII - Quadratic Equations
Question
1
1.
Solve :
16
x
2
−
10
a
b
x
+
a
2
b
2
= 0
2
a
b
5
,
a
b
10
3
a
b
4
,
3
a
b
8
a
b
4
,
−
a
b
8
4
a
b
8
,
a
b
8
2
a
b
3
,
a
b
6
Question
2
2.
Find the discriminant of the quadratic equation
(
x
2
+
4
x
+
4
)
=
0
-1
3
-3
0
1
Question
3
3.
Find the roots of the quadratic equation
(
x
2
−
5
x
+
4
)
=
0
(
4
,
1
)
(
7
,
-2
)
(
5
,
0
)
(
5
,
1
)
(
7
,
0
)
Question
4
4.
Solve the quadratic equation
x
+
4
=
−
3
x
(
1
,
-4
)
(
0
,
-4
)
(
1
,
-6
)
(
-1
,
-3
)
(
0
,
-3
)
Question
5
5.
Find the roots of the quadratic equation
(
40
x
2
+
7
x
−
20
)
=
0
(
5
8
,
(
-4
5
)
)
(
7
8
,
(
-4
3
)
)
(
1
2
,
(
-4
3
)
)
(
1
2
,
(
-4
5
)
)
(
7
8
,
(
-6
5
)
)
Question
6
6.
Find the roots of the quadratic equation
(
24
x
2
−
52
x
+
20
)
=
0
(
7
5
,
1
2
)
(
7
3
,
(
-1
2
)
)
(
7
3
,
1
)
(
5
3
,
1
2
)
(
7
5
,
1
)
Question
7
7.
Find the roots of the quadratic equation
(
x
2
+
14
x
+
45
)
=
0
(
-4
,
-10
)
(
-5
,
-9
)
(
-3
,
-10
)
(
-3
,
-11
)
(
-4
,
-9
)
Question
8
8.
Solve :
(
2
x
+
4
)
(
x
−
5
)
=
(
8
x
+
3
)
(
x
+
10
)
(
5
6
,
-11
)
(
(
-5
4
)
,
10
)
(
(
-1
2
)
,
14
)
(
(
-7
6
)
,
8
)
(
(
-5
6
)
,
11
)
Question
9
9.
Solve :
−
3
(
−
x
+
2
)
−
4
(
−
x
−
2
)
=
−
3
(
x
−
4
)
(
3
2
√
5
+
1
10
√
265
)
,
(
3
2
√
5
−
1
10
√
265
)
(
3
2
√
4
+
1
10
√
265
)
,
(
3
2
√
4
−
1
10
√
265
)
(
3
2
+
1
10
√
265
)
,
(
3
2
−
1
10
√
265
)
(
3
2
+
1
10
√
795
)
,
(
3
2
−
1
10
√
795
)
(
3
2
+
1
10
√
530
)
,
(
3
2
−
1
10
√
530
)
Question
10
10.
Solve :
5
(
x
−
5
)
−
1
(
x
+
1
)
=
−
2
5
,
(
−
1
)
5
√
3
,
(
−
√
3
)
5
√
4
,
(
−
√
4
)
5
√
2
,
(
−
√
2
)
5
√
5
,
(
−
√
5
)
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