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Mathematics 11 Online
OpenStudy (anonymous):

How do I know what way to do the cross products? For example: find the plane through the points A(5,6,7) B(1,2,-1) and C(3,-1,2) I did A-B to get a vector (U) and A-C to get the other one (V), but when i do UxV i get (-9,-1,5) and the answer is (9,1,-5) so how do i know which way to cross them?

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