A plane passing through point (2,1, - 1) and parallel to vector = (3,0,1) and = (4, - 1,2), try to find the plane equation What's the matter with vector multiplication? I'm depressed. I hope you can give me some advice The one in the middle should be 3 & nbsp; 1 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 1 & nbsp; 3 && nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 2 & nbsp; 4 & nbsp; how can it be 2 & nbsp; 4?

A plane passing through point (2,1, - 1) and parallel to vector = (3,0,1) and = (4, - 1,2), try to find the plane equation What's the matter with vector multiplication? I'm depressed. I hope you can give me some advice The one in the middle should be 3 & nbsp; 1 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 1 & nbsp; 3 && nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 2 & nbsp; 4 & nbsp; how can it be 2 & nbsp; 4?

This is the vector inner product, also known as cross product, which is solved by determinant 21 - 130 14 - 12. The first determinant is the algebraic cofactor of 2, the second is the algebraic cofactor of 1, and the third is the algebraic cofactor of - 1. Note that the algebraic cofactor has a signed relationship. For example, the algebraic cofactor of 1, you should go to college