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Byju's Answer
Standard XII
Mathematics
Basic Inverse Trigonometric Functions
The value of ...
Question
The value of
x
for which
12
x
−
6
<
0
and
12
−
3
x
<
0
A
ϕ
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B
R
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C
R
−
{
0
}
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D
none of these
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Solution
The correct option is
A
ϕ
12
x
−
6
<
0
⟹
x
<
1
2
12
−
3
x
<
0
⟹
x
>
4
⟹
x
∈
ϕ
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0
Similar questions
Q.
Assertion (A): The function
f
(
x
)
=
2
x
3
−
3
x
2
−
12
x
+
8
has minimum value -12 at x = 2
Reason (R): For the fucntion
f
(
x
)
=
2
x
3
−
3
x
2
−
12
x
+
8
,
f
′
(
2
)
=
0
and
f
′′
(
2
)
>
0
Q.
(a) For real values of x, prove that the value of the expression
11
x
2
+
12
x
+
6
x
2
+
4
x
+
2
cannot lie between
−
5
and
3
(b)
x
2
+
(
a
−
b
)
x
+
(
1
−
a
−
b
)
=
0
,
a
,
b
ϵ
R
. Find the condition on a, for which both roots of the equation are real and unequal.
(c) Determine the values of x which satisfy the inequalities
x
2
−
3
x
+
2
>
0
and
x
2
−
3
x
−
4
≤
0
.
Q.
If
r
→
·
a
→
=
r
→
·
b
→
=
r
→
·
c
→
=
0
for some non-zero vector
r
→
,
then the value of
a
→
b
→
c
→
,
is
(a) 2
(b) 3
(c) 0
(d) none of these
Q.
Find the range of
′
a
′
for which :
(a)
a
x
2
+
3
x
+
4
>
0
∀
x
∈
R
(b)
a
x
2
+
4
x
−
2
<
0
∀
x
∈
R
Q.
The range of
k
, for which the inequality
k
x
2
−
3
k
x
+
3
<
0
,
(
where
x
∈
R
)
holds true is
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