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Question

If A=(1,1,1) and C=(0,1,1) are given vectors, then vector B satisfying the equation A×B=C and A.B=3 is

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Solution

Let B=x^iy^j+z^k
According to question
A.B=3
x+y+z=3
Also, A×B=C
∣ ∣ijk111xyz∣ ∣=^j^k
i(zy)j(zx)+k(yx)=^j^k
Comparing coefficients
zy=0z=y
zx=1z=x1
yx=1
x1+x1+x=33x2=3x=53
y=23=z
B=53^i+23^j+23^k
B=(53,23,23)

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