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Byju's Answer
Standard XII
Mathematics
Applications of Dot Product
If a is a u...
Question
If
→
a
is a unit vector and
(
→
x
−
→
a
)
.
(
→
x
+
→
a
)
=
35
, then find
|
→
x
|
.
Open in App
Solution
Given:
|
→
a
|
=
1
So,
(
→
x
−
→
a
)
.
(
→
x
+
→
a
)
=
35
=
→
x
.
→
x
+
→
x
.
→
a
−
→
a
.
→
x
−
→
a
.
→
a
=
35
=
|
→
x
|
2
−
|
→
a
|
2
=
35
=
|
→
x
|
2
−
1
=
35
=
|
→
x
|
=
6
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