Question

If a =2i+3j+4k then what is the value of a

Answer 1

Answer:

0

Explanation:

a=2i+3j+4k

b=i+j−k

c=i−j+k

a×(b×c)=(a⋅c)b−(a⋅b)c

=(2−3+4)b−(2+3−4)c

=3b−c

=(3

i

^

+3

j

^

−3

k

^

)−(i−j+k)

=2

i

^

+4

j

^

−4

k

^

a.(a×(b×c))=2×2+3×4+4×(−4)=0

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