What is the cross product of #[2, 1, -4]# and #[-1, -1, 2] #?

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Answer 1 · 2016-04-17T19:13:37

#A X B=-2 hat i-hat k#

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#A=[2,1,-4]#

#B=[-1,-1,2]#

#A X B=hat i(1*2-1*4)-hat j(2*2-4*1)+hat k(2*(-1)+1*1)#

#A X B=hat i(2-4)-hat j(4-4)+ hat k(-2+1)#

#A X B=-2hat i-0hat j-hat k#

#A X B=-2 hat i-hat k#