r.k where r=xi+yj+zk
The Attempt at a Solution
is the answer to this just z or is it x+y
Ok, good. So, presumably, this definition is for two vectors a=(a1,a2,a3) and b=(b1,b2,b3). Can you write your two vectors in this form?Dot product of 2 vectors a.b is a1b1+a2b2+a3c3?
Hold on.. this doesn't agree with what you stated above. Have another think...i think k.k = 0