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