If A = 1 + 2ĵ-K and B=21-+3k. Calculate | Ã +B|
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Answer:
Let
a
=
i
+2
j
+3
k
b
=3
i
+
j
a
+
b
=
i
+2
j
+3
k
+3
i
+
j
a
+
b
=4
i
+3
j
+3
k
Sounitvectorinthedirectionof
a
+
b
∣
∣
∣
∣
a
+
b
∣
∣
∣
∣
=
4
2
+3
2
+3
2
=
16+9+9
=
34
sounitvectorinthedirectionof
a
+
b
is
=
34
4
i
+
34
3
j
+
34
3
k
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