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Class VI
Class VII
Class VIII
Class IX
Class X
ICSE Grade IX - Logarithms
Question
1
1.
Find the value of
x
if
log
2
x
=
4
16
18
17
13
15
Question
2
2.
Find the value of
x
if
log
x
27
=
3
3
4
2
0
6
Question
3
3.
log
8.09
64.6400
=
log
64.6400
÷
log
8.09
log
64.6400
−
log
8.09
log
64.6400
+
log
8.09
log
64.6400
✕
log
8.09
log
8.09
÷
log
64.6400
Question
4
4.
If
x
=
y
2
(
y
−
1
)
, then
log
(
x
−
y
)
=
log
x
log
y
log
x
−
log
y
log
x
+
log
y
log
x
log
y
Question
5
5.
log
49
343
=
9.5
3.5
2.5
1.5
0.5
Question
6
6.
log
13
27
+
log
4
10
=
log
26
135
log
8
45
log
28
135
log
2
(
26
135
)
log
26
133
Question
7
7.
log
1
5
−
log
42
59
=
log
59
210
log
19
70
log
61
210
log
2
(
59
210
)
log
59
208
Question
8
8.
log
8
16
=
9.3333
0.3333
2.3333
3.3333
1.3333
Question
9
9.
Find the value of
x
if
log
5
(
x
2
−
24
)
=
2
(
8
,
(
−
7
)
)
(
7
,
(
−
6
)
)
(
7
,
(
−
7
)
)
(
8
,
(
−
6
)
)
Question
10
10.
log
3
21
=
log
6
21
−
log
3
6
log
6
21
÷
log
3
6
log
6
21
✕
log
3
6
log
6
21
+
log
3
6
log
3
6
÷
log
6
21
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