Originally Posted by

**a_desenhista** I was reading a solution and got really confused trying to follow it. Here is what it said.

Find the equation of a plane passing through e(1,2,3), f(2,5,4) and g(3,4,6)

A normal to the plane is EF x FG (which I deciphered to mean (F-E) and (G-F)

since it then said (1,3,1) x (1,-1,2).

Now the part that really throws me off is here...it then says the answer is (7,-1,-4) therefore the equation is 7x - y - 4z = D. Afterwards they plugged in one of the points into the equation to get D.

But where did (7,-1,-4) come from?? Help, I'm so lost!