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Shatzkinator
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Homework Statement
If d1 = 3i - 2j +4k and d2 = -5i + 2j -k, then what is (d1 + d2) . (d1 x 4d2)?
Homework Equations
c = absin(theta) --> vector product
c = abcos(theta) --> scalar product
The Attempt at a Solution
I looked at a sample problem and they show the distributive law for components, however one of the calculations was 3i x 3k = 9(-j)... how does that work (ie. using the above formula does not take into account any of the letters or unit vectors or whatever)? Second, how do you know if its vector or scalar product. Thanks a bunch...