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Byju's Answer
Standard XII
Mathematics
Applications of Dot Product
Show that vec...
Question
Show that vectors
|
→
b
|
→
a
+
|
→
a
|
→
b
a
n
d
|
→
b
|
→
a
−
|
→
a
|
→
b
are orthogonal.
Open in App
Solution
→
x
=
∣
∣
→
b
∣
∣
→
a
+
|
→
a
|
→
b
→
y
=
∣
∣
→
b
∣
∣
→
a
−
|
→
a
|
→
b
→
x
and
→
y
are orthogonal if their dot product
→
x
⋅
→
y
=
0
(
∣
∣
→
b
∣
∣
→
a
+
|
→
a
|
→
b
)
⋅
(
∣
∣
→
b
∣
∣
→
a
−
|
→
a
|
→
b
)
=
∣
∣
→
b
∣
∣
2
→
a
⋅
→
a
−
|
→
a
|
∣
∣
→
b
∣
∣
→
a
⋅
→
b
+
|
→
a
|
∣
∣
→
b
∣
∣
→
a
⋅
→
b
−
|
→
a
|
2
→
b
⋅
→
b
=
∣
∣
→
b
∣
∣
2
|
→
a
|
2
−
|
→
a
|
2
∣
∣
→
b
∣
∣
2
=
0
So,
→
x
and
→
y
are orthogonal
Suggest Corrections
0
Similar questions
Q.
Show that vectors
|
→
b
|
→
a
+
|
→
a
|
→
b
and
|
→
b
|
→
a
−
|
→
a
|
→
b
are orthogonal.
Q.
Show that
|
→
a
|
→
b
+
|
→
b
|
→
a
is perpendicular to
|
→
a
|
→
b
−
|
→
b
|
→
a
, for any two nonzero vectors
→
a
and
→
b
.
Q.
Show that
|
→
a
|
→
b
+
|
→
b
|
→
a
is perpendicular to
|
→
a
|
→
b
−
|
→
b
|
→
a
for any two nonzero vectors
→
a
and
→
b
Q.
If
→
a
=
(
5
^
i
−
^
j
+
3
^
k
)
and
→
b
=
(
^
i
+
3
^
j
−
5
^
k
)
then show that
(
→
a
+
→
b
)
and
(
→
a
−
→
b
)
are orthogonal.
Q.
If
→
a
,
→
b
,
→
c
are vectors such that
→
a
.
→
b
=
→
a
.
→
c
,
→
a
×
→
b
=
→
a
×
→
c
,
→
a
≠
0
, Then show that
→
b
=
→
c
.
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