2. If A = 3i + i + 2k and B = 21 - 2} + 4 then unit vector perpendicular to the plane containing A and B
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We have
a
−
b
=−
i
^
+
j
^
+
k
^
c
−
b
=
i
^
−5
j
^
−5
k
^
(
a
−
b
)×(
c
−
b
)=
∣
∣
∣
∣
∣
∣
∣
∣
i
^
−1
1
j
^
1
−5
k
^
1
−5
∣
∣
∣
∣
∣
∣
∣
∣
=−4
j
^
+4
k
^
The required unit vector is:
∣(
a
−
b
)×(
c
−
b
)∣
(
a
−
b
)×(
c
−
b
)
=
4
2
−4
j
^
+4
k
^
=
2
−
j
^
+
k
^
.
Explanation: pls mark me brainliest
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