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What is the cross product of #(4 i + 4 j + 2 k)# and #(- 4 i - 5 j + 2 k)#?

Answer 1

#A X B=18i-16j#

#A=(x,y,z)# #B=(a,b,c)# #A X B=i(y*c-z*b)-j(x*c-z*a)+k(x*b-y*a)# #A=4i+4j+2k# #B=-4i-5j+2k# #A X B=i(8+10)-j(8+8)+k(-20+20)# #A X B=18i-16j+0# #A X B=18i-16j#

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Answer 2

Leo Abeyta

The cross product is (14i - 12j - 24k).

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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