If P = 2i+3k + 4k & = 3i– 4j find P+ 0.
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Answer:
Given,
P
=2
i
^
+4
j
^
+14
k
^
and
Q
=4
i
^
+4
j
^
+10
k
^
So,
P
+
Q
=(2
i
^
+4
j
^
+14
k
^
)+(4
i
^
+4
j
^
+10
k
^
)=6
i
^
+8
j
^
+24
k
^
Thus, the magnitude of P+Q=∣
P
+
Q
∣=
6
2
+8
2
+24
2
=
676
=26
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