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Class VI
Class VII
Class VIII
Class IX
Class X
ICSE Grade VIII - Special Products and Expansions
Question
1
1.
If
(
a
2
−
b
2
)
=
32
,
a
b
=
12
, find
(
a
−
b
)
1
4
6
3
5
Question
2
2.
If
(
x
2
+
1
x
2
)
=
18
,
find the value of
(
x
−
1
x
)
7
2
5
4
3
Question
3
3.
If
(
5
a
+
2
b
)
=
24
,
a
b
=
8
, find
(
25
a
2
+
4
b
2
)
417
416
413
415
419
Question
4
4.
Expand
(
x
+
1
x
)
2
x
2
+
2
+
1
x
2
x
2
+
2
+
4
x
2
−
2
x
2
+
2
+
1
x
2
x
2
+
1
+
1
x
2
x
2
+
3
+
1
x
2
Question
5
5.
If
(
x
−
1
x
)
=
7
,
find the value of
(
x
2
+
1
x
2
)
48
52
54
51
50
Question
6
6.
(
3
2
a
+
2
b
−
2
3
c
)
2
(
9
4
a
2
+
6
a
b
−
2
a
c
+
4
b
2
−
8
3
b
c
+
4
9
c
2
)
(
5
2
a
2
+
6
a
b
−
2
a
c
+
4
b
2
−
8
3
b
c
+
4
9
c
2
)
(
9
4
a
2
+
3
a
b
−
2
a
c
+
4
b
2
−
8
3
b
c
+
4
9
c
2
)
(
13
6
a
2
+
6
a
b
−
2
a
c
+
4
b
2
−
8
3
b
c
+
4
9
c
2
)
(
9
4
a
2
+
9
a
b
−
2
a
c
+
4
b
2
−
8
3
b
c
+
4
9
c
2
)
Question
7
7.
(
−
3
a
+
2
b
)
(
−
3
a
−
2
b
)
(
9
a
2
−
4
b
2
)
(
8
a
2
−
4
b
2
)
(
9
a
2
−
6
b
2
)
(
9
a
2
−
2
b
2
)
(
10
a
2
−
4
b
2
)
Question
8
8.
Evaluate :
995
2
−
5
2
9900000
990000
990995
990005
99000
Question
9
9.
If
(
x
2
+
1
x
2
)
=
79
,
find the value of
(
x
+
1
x
)
6
9
10
11
8
Question
10
10.
If
(
a
−
b
)
=
2
,
a
b
=
8
, find
(
a
2
−
b
2
)
15
13
12
11
10
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