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Mathematics 7 Online
OpenStudy (anonymous):

Three vectors are given: a = 2i - 3j - k b = 2i - j c = -3j + k Find a unit vector perpendicular to b and to a - c a - c = 2i - 2k

OpenStudy (anonymous):

First . You need to take cross product of b vector and (a-c) vector. Do you know how to do that?

OpenStudy (anonymous):

Yes. I skimmed over my notes trying to find the formula, but it seems I'm either skipping it or it's not there.

OpenStudy (anonymous):

Ok. You can have a look at the video here http://www.youtube.com/watch?v=qsgK1d-_8ik

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