if i have to find the cross product of a vector, lets say

u=5i -2j

v=3i-4j

is it just -20i +6j? i know how to do a 3 by 2 but without a z term i don't know how to solve it. could i just add in two 0's for z and then solve the 3 by 2?

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- January 25th 2010, 06:39 PMisuckatcalc2 by 2 determinant
if i have to find the cross product of a vector, lets say

u=5i -2j

v=3i-4j

is it just -20i +6j? i know how to do a 3 by 2 but without a z term i don't know how to solve it. could i just add in two 0's for z and then solve the 3 by 2? - January 25th 2010, 07:00 PMCalculus26Quote:

could i just add in two 0's for z and then solve the 3 by 2?

The cross product is only defined for 3-D vectors and hence 3x3 matrices. So you do just as you suggested treat each vector as having 0 z components.