Question

Plz help No spams Will mark u brainiest.

Answer 1

We know that The Cross product of 2 vectors is perpendicular to both the vectors

Let it be X

$a×b=(i-j-k)×(i+j+k)$

$X=0i-2j+2k=2(-j+k)$

$unit\:vector=\frac{2(-j+k)} {\sqrt{1^{2}+1^{2}}}=\sqrt{2}×(-j+k)$

$option\: c \:i.e\frac{1}{\sqrt{2}}(-j+k)$

Actually I'm getting

$\sqrt{2} \: as \: numerator \:$

so was confused But I mhst haved Mistaken somewhere

Anyway If in case it is wrong

You can simply

Get the cross product and then find unit vector by dividing vector by Magnitude

Answer 2

option c is correct for your question