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Class VI
Class VII
Class VIII
Class IX
Class X
ICSE Grade VIII - Special Products and Expansions
Question
1
1.
(
c
1
3
+
d
1
3
+
e
1
3
)
(
c
2
3
+
d
2
3
+
e
2
3
−
c
1
3
d
1
3
−
d
1
3
e
1
3
−
e
1
3
c
1
3
)
=
c
+
d
+
e
−
3
e
1
3
c
1
3
d
1
3
0
(
c
+
d
+
e
)
2
(
c
−
d
−
e
)
2
(
c
−
d
−
e
)
Question
2
2.
Evaluate
(
c
1
3
+
d
1
3
)
(
c
2
3
−
c
1
3
d
1
3
+
d
2
3
)
=
c
+
d
(
c
+
d
)
2
c
−
d
(
c
−
d
)
2
0
Question
3
3.
If
(
a
+
b
)
=
9
,
a
b
=
20
, find
(
a
3
+
b
3
)
190
188
192
189
186
Question
4
4.
(
−
3
a
−
2
3
b
−
3
c
)
2
(
9
a
2
+
a
b
+
18
a
c
+
4
9
b
2
+
4
b
c
+
9
c
2
)
(
10
a
2
+
4
a
b
+
18
a
c
+
4
9
b
2
+
4
b
c
+
9
c
2
)
(
9
a
2
+
4
a
b
+
18
a
c
+
4
9
b
2
+
4
b
c
+
9
c
2
)
(
9
a
2
+
6
a
b
+
18
a
c
+
4
9
b
2
+
4
b
c
+
9
c
2
)
(
8
a
2
+
4
a
b
+
18
a
c
+
4
9
b
2
+
4
b
c
+
9
c
2
)
Question
5
5.
Evaluate
(
c
1
2
+
d
1
2
)
(
c
1
2
−
d
1
2
)
=
(
c
+
d
)
2
0
1
(
c
−
d
)
(
c
+
d
)
Question
6
6.
(
−
2
3
a
−
3
2
b
)
2
(
4
9
a
2
−
a
b
+
9
4
b
2
)
(
4
7
a
2
+
2
a
b
+
9
4
b
2
)
(
4
9
a
2
+
4
a
b
+
9
4
b
2
)
(
4
11
a
2
+
2
a
b
+
9
4
b
2
)
(
4
9
a
2
+
2
a
b
+
9
4
b
2
)
Question
7
7.
If
(
a
+
b
+
c
)
=
11
,
(
a
b
+
a
c
+
b
c
)
=
34
, find
(
a
2
+
b
2
+
c
2
)
51
54
56
53
52
Question
8
8.
Expand
(
x
−
1
x
)
(
x
+
1
x
)
(
x
2
+
1
x
2
)
x
4
−
1
x
4
x
5
+
x
3
+
x
+
1
x
3
x
5
+
7
x
+
3
x
3
+
7
x
+
4
x
3
+
4
x
5
−
x
−
2
x
3
−
1
x
7
Question
9
9.
(
3
a
−
b
)
3
(
27
a
3
−
27
a
2
b
+
9
a
b
2
−
b
3
)
(
27
a
3
−
24
a
2
b
+
9
a
b
2
−
b
3
)
(
28
a
3
−
27
a
2
b
+
9
a
b
2
−
b
3
)
(
27
a
3
−
29
a
2
b
+
9
a
b
2
−
b
3
)
(
26
a
3
−
27
a
2
b
+
9
a
b
2
−
b
3
)
Question
10
10.
The value of
294
✕
298
is
87615
87612
87611
87610
87613
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