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CBSE Class 12 Math 2020 Outside Delhi Set 1 Solved Paper

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Question : 24
Total: 36
Find |
→
a
| and |
→
b
|, if |
→
a
|=2|
→
b
| and (
→
a
+
→
b
)⋅(
→
a
−
→
b
)=12.
OR
Find the unit vector perpendicular to each of the vectors
→
a
=4
^
i
+3
^
j
+
^
k
 and
→
b
=2
^
i
−
^
j
+2
^
k
.
Solution:     👈: Video Solution
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