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April 20, 2014

April 20, 2014

Posted by **Sam** on Monday, April 23, 2012 at 7:19pm.

u= (6,7)

v= (-3,9)

- trig -
**Damon**, Monday, April 23, 2012 at 7:27pmCould be a dot product (scalar product) or could be a vector product (cross product)

If a dot product then

6*-3 + 7*9 = 45

If a cross product then

i j k

6 7 0

-3 9 0 do determinant

k (6*9 -(7*-3) ) = k (54+21) = 75 in z direction

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