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Class VI
Class VII
Class VIII
Class IX
Class X
ICSE Grade X - Quadratic Equations
Question
1
1.
Solve :
18
x
2
a
4
b
2
+
9
x
a
2
b
−
2
= 0
−
4
9
a
2
b
,
1
2
a
2
b
−
6
11
a
2
b
,
1
8
a
2
b
−
2
3
a
2
b
,
1
6
a
2
b
−
6
7
a
2
b
,
1
4
a
2
b
−
8
9
a
2
b
,
−
1
6
a
2
b
Question
2
2.
Solve :
(
x
2
−
7
x
)
2
−
9
(
x
2
−
7
x
)
+
20
=
0
(
5
2
+
1
2
√
69
)
,
(
5
2
−
1
2
√
69
)
,
(
5
2
+
1
2
√
65
)
,
(
5
2
−
1
2
√
65
)
(
9
2
+
1
2
√
69
)
,
(
9
2
−
1
2
√
69
)
,
(
9
2
+
1
2
√
65
)
,
(
9
2
−
1
2
√
65
)
(
7
2
+
1
2
4
√
69
)
,
(
7
2
−
1
2
4
√
69
)
,
(
7
2
+
1
2
4
√
65
)
,
(
7
2
−
1
2
4
√
65
)
(
7
2
+
69
2
)
,
(
7
2
−
69
2
)
,
(
7
2
+
65
2
)
,
(
7
2
−
65
2
)
(
7
2
+
1
2
√
69
)
,
(
7
2
−
1
2
√
69
)
,
(
7
2
+
1
2
√
65
)
,
(
7
2
−
1
2
√
65
)
Question
3
3.
Find the quadratic equation, the sum of whose roots is
(
-10
7
)
and product is
25
49
(
49
x
2
+
72
x
+
25
)
=
0
(
49
x
2
+
70
x
+
25
)
=
0
(
49
x
2
+
68
x
+
25
)
=
0
(
48
x
2
+
70
x
+
25
)
=
0
(
50
x
2
+
70
x
+
25
)
=
0
Question
4
4.
Find the discriminant of the quadratic equation
(
x
2
−
8
x
+
16
)
=
0
0
-1
-3
2
1
Question
5
5.
Find the roots of the quadratic equation correct to two decimal places
(
−
36
x
2
−
34
x
+
30
)
=
0
5.50 , 7.56
0.50 , 2.56
6.50 , 8.56
6.50 , 1.56
-1.50 , 0.56
Question
6
6.
Find the quadratic equation, the sum of whose roots is
-6
and product is
9
(
6
x
+
9
)
=
0
(
x
2
+
6
x
+
9
)
=
0
(
x
2
+
4
x
+
9
)
=
0
(
2
x
2
+
6
x
+
9
)
=
0
(
x
2
+
9
x
+
9
)
=
0
Question
7
7.
The sum of the roots of the quadratic equation
(
x
2
−
12
x
+
36
)
=
0
is
9
11
12
14
13
Question
8
8.
Solve :
21
x
2
b
2
−
8
a
2
x
b
−
5
a
4
= 0
a
2
b
,
−
a
2
9
b
5
a
2
9
b
,
−
3
a
2
11
b
a
2
b
,
−
3
a
2
7
b
3
a
2
7
b
,
−
5
a
2
9
b
5
a
2
7
b
,
−
a
2
3
b
Question
9
9.
Solve :
40
x
2
−
35
x
−
8
x
b
+
7
b
= 0
5
8
,
−
b
5
9
8
,
3
b
5
7
10
,
b
7
7
8
,
b
5
7
6
,
b
3
Question
10
10.
Find the quadratic equation with roots
(
2
3
,
2
3
)
(
9
x
2
−
12
x
+
4
)
=
0
(
3
x
2
−
2
x
)
=
0
(
9
x
2
−
18
x
+
8
)
=
0
(
15
x
2
−
16
x
+
4
)
=
0
(
3
x
2
−
8
x
+
4
)
=
0
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