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Byju's Answer
Standard XII
Mathematics
Condition for a Conic to Be a Pair of Straight Lines
If A⃗ = 1,1...
Question
If
→
A
= (1,1,1) and
→
C
= (0,1,1) are given vectors, then find a vector
→
B
satisfying the equation
→
A
×
→
B
=
→
C
a
n
d
→
A
.
→
B
=
3
Open in App
Solution
→
A
×
→
B
=
→
C
→
A
×
(
→
A
×
→
B
)
=
→
A
×
→
C
⇒
(
→
A
.
→
B
)
→
A
−
(
→
A
.
→
A
)
→
B
=
→
A
×
→
C
⇒
3
→
A
−
3
→
B
=
→
A
×
→
C
→
A
×
→
C
=
∣
∣ ∣ ∣
∣
^
i
^
j
^
k
1
1
1
0
1
1
∣
∣ ∣ ∣
∣
=
^
i
(
0
)
+
^
j
(
−
1
)
+
^
h
(
1
)
=
−
^
j
+
^
k
⇒
3
→
B
=
3
(
^
i
+
^
j
+
^
k
)
−
(
−
^
j
+
^
k
)
⇒
3
→
B
=
3
^
i
+
4
^
j
+
2
^
k
→
B
=
^
i
+
4
3
^
j
+
2
3
^
k
Suggest Corrections
0
Similar questions
Q.
If
→
A
=
(
1
,
1
,
1
)
,
→
C
=
(
0
,
1
,
−
1
)
are given vectors, then a vector
→
B
satisfying the equation
→
A
×
→
B
=
→
C
and
→
A
.
→
B
=
3
is :
Q.
If
→
A
=
(
1
,
1
,
1
)
and
→
C
=
(
0
,
1
,
−
1
)
are given vectors, then vector
→
B
satisfying the equation
→
A
×
→
B
=
→
C
and
→
A
.
→
B
=
3
is
−
Q.
If
→
a
,
→
b
,
→
c
are unit vectors and
→
b
,
→
c
are non-collinear vectors satisfying
(
→
a
,
→
b
)
=
α
,
(
→
a
,
→
c
)
=
β
and
→
a
×
(
→
b
×
→
c
)
=
→
b
+
→
c
2
then
c
o
s
(
α
+
β
)
=
Q.
Let
→
A
=
→
b
×
→
c
,
→
B
=
→
c
×
→
a
,
→
C
=
→
a
×
→
b
, then the vectors
→
A
×
(
→
B
×
→
C
)
,
→
B
×
(
→
C
×
→
A
)
, and
→
C
×
(
→
A
×
→
B
)
are
Q.
If
→
a
,
→
b
,
→
c
are unit vectors such that
→
a
+
→
b
+
→
c
=
→
0
and
(
→
a
,
→
b
)
=
π
3
, then
∣
∣
→
a
×
→
b
∣
∣
+
∣
∣
→
b
×
→
c
∣
∣
+
|
→
c
×
→
a
|
=
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