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Class VI
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ICSE Grade VIII - Quadratic Equations
Question
1
1.
Solve :
(
x
−
2
)
(
x
−
6
)
+
(
x
−
8
)
(
x
−
10
)
=
68
21
(
8
,
12
)
(
8
,
16
)
(
116
15
,
14
)
(
102
13
,
13
)
(
100
13
,
10
)
Question
2
2.
Find the roots of the quadratic equation
(
x
2
+
6
x
+
8
)
=
0
(
-2
,
-4
)
(
0
,
-5
)
(
0
,
-6
)
(
-1
,
-5
)
(
-1
,
-4
)
Question
3
3.
Find the discriminant of the quadratic equation
(
x
2
−
7
x
+
10
)
=
0
9
8
11
7
10
Question
4
4.
Solve :
9
x
2
−
9
a
b
x
+
2
a
2
b
2
= 0
a
b
3
,
2
a
b
3
a
b
5
,
2
a
b
5
a
b
,
4
a
b
3
−
a
b
3
,
0
a
b
,
2
a
b
Question
5
5.
Find the roots of the quadratic equation
(
24
x
2
+
8
x
−
16
)
=
0
(
2
5
,
-1
)
(
2
5
,
-2
)
(
4
3
,
-3
)
(
4
3
,
-2
)
(
2
3
,
-1
)
Question
6
6.
Solve :
(
3
x
+
6
)
(
x
+
10
)
=
(
5
x
+
10
)
(
3
x
+
2
)
(
11
,
-2
)
(
14
,
0
)
(
-11
,
2
)
(
10
,
-3
)
(
9
,
-5
)
Question
7
7.
Find the roots of the quadratic equation
(
20
x
2
−
36
x
+
16
)
=
0
(
3
,
2
5
)
(
1
,
4
5
)
(
2
,
4
5
)
(
3
,
4
3
)
(
2
,
4
3
)
Question
8
8.
Find the roots of the quadratic equation
(
x
2
−
7
x
+
10
)
=
0
(
7
,
0
)
(
6
,
1
)
(
5
,
2
)
(
7
,
1
)
(
6
,
2
)
Question
9
9.
Solve the quadratic equation
x
−
6
x
=
1
(
3
,
-2
)
(
4
,
-2
)
(
5
,
-3
)
(
5
,
-4
)
(
4
,
-3
)
Question
10
10.
Solve :
−
1
(
−
x
−
1
)
−
2
(
−
x
+
1
)
=
5
(
−
√
2
)
,
√
2
(
−
√
3
)
,
√
3
(
−
√
5
)
,
√
5
(
−
√
4
)
,
√
4
(
−
1
)
,
1
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