if a=i+2j+3k and b=-2i+2j+k then A•B =
Answers
Answered by
1
Answer:
We have
a
=
i
+2
j
−3
k
b
=3
i
−
j
+2
k
∴
a
+
b
=4
i
+
j
−
k
a
−
b
=−2
i
+3
j
−5
k
Then
(
a
+
b
).(
a
−
b
)=−8+3+5=0
Hence,
∴(
a
+
b
)⊥(
a
−
b
)
Proved.
Explanation:
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