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*Like a boss*Lol ... this is vector multiplication, you can't just multiply like that normally. And the result is a cross product of two vectors ... I'll just post a pic of how to do it.
Don't mind the pencil mapping thing ... i tried visually doing the multiplication ... looks like a mess.
And yes, I'm doing that coz the cross product of two vectors gives you a 3rd vector that is perpendicular to both the original 2 vectors you are multiplying.
So in your question, if the vector is perpendicular to both j and BC, then it is also perpendicular to the plane. I've taken j since we have not been given any other information sufficient to solve the problem. So we get n and voila! You have your eqn of the plane. B|
Thanksss
Ohh yes I usually try to avoid that cross multiplication and just use the ratio's to find the normal