What is the cross product of $<1,2,-4>$ and $<-1,-1,2>$ ?

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Answer 1 · 2016-03-05T13:46:15

$vec a x vec b=2j+k$

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$vec a=<1,2,-4>" " vec b=<-1,-1,2>$
$vec a x vec b=i(4-4)-j(2-4)+k(-1+2)$
$vec a x vec b=2j+k$

What is the cross product of <1,2,-4><1,2,-4> and <-1,-1,2><-1,-1,2>?