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Standard XII
Mathematics
Question
If
a
x
y
=
(
a
x
)
y
, then
x
y
−
1
.
y
x
−
1
=
____
y
x
x
y
xy
y
x
A
x
y
B
y
x
C
y
x
D
xy
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Solution
Verified by Toppr
Given
a
x
y
=
(
a
x
)
y
⇒
a
x
y
=
a
x
y
Apply logarithm on both sides with base
a
⇒
log
a
a
x
y
=
log
a
a
x
y
⇒
x
y
(
log
a
a
)
=
x
y
(
log
a
a
)
…
[
∵
log
t
m
=
m
log
t
]
⇒
x
y
(
1
)
=
x
y
(
1
…
[
∵
log
a
a
=
1
]
⇒
x
y
=
x
y
⇒
x
y
x
=
y
⇒
x
y
−
1
=
y
…
(
i
)
Required
x
y
−
1
.
y
x
−
1
=
y
.
y
x
−
1
[
f
r
o
m
(
i
)
]
x
y
−
1
.
y
x
−
1
=
y
1
+
x
−
1
x
y
−
1
.
y
x
−
1
=
y
x
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