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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
e
1
3
+
f
1
3
+
g
1
3
= 0, then
(
e
+
f
+
g
)
=
3
e
f
g
(
e
+
f
+
g
)
3
=
27
e
f
g
(
e
+
f
+
g
)
=
3
e
1
3
f
1
3
g
1
3
(
e
+
f
+
g
)
=
27
e
f
g
Question
2
2.
(
2
a
+
5
b
)
(
2
a
−
5
b
)
(
4
a
2
−
23
b
2
)
(
5
a
2
−
25
b
2
)
(
3
a
2
−
25
b
2
)
(
4
a
2
−
25
b
2
)
(
4
a
2
−
27
b
2
)
Question
3
3.
If
(
a
2
−
b
2
)
=
9
,
a
b
=
20
, find
(
a
−
b
)
1
0
3
-2
2
Question
4
4.
If
(
a
−
b
)
=
1
,
a
b
=
20
, find
(
a
2
−
b
2
)
7
8
12
10
9
Question
5
5.
The value of
104
✕
96
is
9985
9984
9981
9986
9983
Question
6
6.
The expanded form of
(
x
+
4
)
(
x
−
3
)
(
x
−
7
)
(
x
−
5
)
is
(
3
x
4
−
11
x
3
+
11
x
2
+
179
x
−
420
)
(
2
x
4
−
11
x
3
+
11
x
2
+
179
x
−
420
)
(
x
4
−
11
x
3
+
11
x
2
+
179
x
−
420
)
(
−
2
x
4
−
11
x
3
+
11
x
2
+
179
x
−
420
)
(
−
11
x
3
+
11
x
2
+
179
x
−
420
)
Question
7
7.
(
3
2
a
+
3
2
b
+
3
c
)
2
(
9
4
a
2
+
7
2
a
b
+
9
a
c
+
9
4
b
2
+
9
b
c
+
9
c
2
)
(
9
4
a
2
+
9
2
a
b
+
9
a
c
+
9
4
b
2
+
9
b
c
+
9
c
2
)
(
13
6
a
2
+
9
2
a
b
+
9
a
c
+
9
4
b
2
+
9
b
c
+
9
c
2
)
(
5
2
a
2
+
9
2
a
b
+
9
a
c
+
9
4
b
2
+
9
b
c
+
9
c
2
)
(
9
4
a
2
+
11
2
a
b
+
9
a
c
+
9
4
b
2
+
9
b
c
+
9
c
2
)
Question
8
8.
The value of
605
✕
609
is
368445
368446
368447
368443
368444
Question
9
9.
(
a
−
b
)
2
(
−
2
a
b
+
b
2
)
(
a
2
−
5
a
b
+
b
2
)
(
2
a
2
−
2
a
b
+
b
2
)
(
a
2
+
a
b
+
b
2
)
(
a
2
−
2
a
b
+
b
2
)
Question
10
10.
If
(
5
x
−
1
3
x
)
=
4
,
find the value of
(
25
x
2
+
1
9
x
2
)
96
5
56
3
20
58
3
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