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Byju's Answer
Standard XII
Mathematics
Test for Monotonicity about a Point
The minimum v...
Question
The minimum value of
f
(
x
)
=
a
a
x
+
a
1
−
a
x
, where
a
,
x
∈
R
and
a
>
0
, is equal to:
A
a
+
1
a
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B
a
+
1
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C
2
a
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D
2
√
a
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Solution
The correct option is
D
2
√
a
Using
A
M
≥
G
M
inequality, we get
a
a
x
+
a
a
a
x
2
≥
(
a
a
x
⋅
a
a
a
x
)
1
2
⇒
a
a
x
+
a
1
−
a
x
≥
2
√
a
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0
Similar questions
Q.
The minimum value of
f
(
x
)
=
a
a
x
+
a
1
−
a
x
, where
a
,
x
∈
R
and
a
>
0
, is equal to:
Q.
Let
A
=
{
(
x
,
y
)
∈
R
×
R
|
2
x
2
+
2
y
2
−
2
x
−
2
y
=
1
}
,
B
=
{
(
x
,
y
)
∈
R
×
R
|
4
x
2
+
4
y
2
−
16
y
+
7
=
0
}
and
C
=
{
(
x
,
y
)
∈
R
×
R
|
x
2
+
y
2
−
4
x
−
2
y
+
5
≤
r
2
}
.
Then the minimum value of
|
r
|
such that
A
∪
B
⊆
C
is equal to:
Q.
Let
f
(
x
)
=
e
a
x
+
e
b
x
,
where
a
≠
b
and
f
′′
(
x
)
−
2
f
′
(
x
)
−
15
f
(
x
)
=
0
for all
x
∈
R
. Then the product
a
b
is equal to
Q.
Let
f
:
R
→
R
be a function defined by
f
(
x
)
=
{
[
x
]
,
x
≤
2
0
,
x
>
2
,
where
[
x
]
is the greatest integer less than or equal to
x
.
If
I
=
2
∫
−
1
x
f
(
x
2
)
2
+
f
(
x
+
1
)
d
x
,
then the value of
(
4
I
–
1
)
is
Q.
Find the least value of f(x) =
a
x
+
b
x
, where a>0, b>0 and x>0.
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