Determinant of a 3x3 matrix: shortcut method (2 of 2) (Opens a modal) Inverting a 3x3 matrix using Gaussian elimination. (Opens a modal) Inverting a 3x3 matrix using determinants Part 1:

Algebra of Matrices Definition. ( Equality of Matrices ). Two m \times n m × n matrices A=\left [a_ {i j}\right] A = [aij] and B=\left [b_y\right] B = [by] are equal if and only if

If you have an n×k matrix, A, and a k×m matrix, B, then you can matrix multiply them together to form an n×m matrix denoted AB. (We sometimes use A.B for the matrix product if that helps to

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Matrices Adding. The two matrices must be the same size, i.e. the rows must match in size, and the columns must match in size. Negative. Subtracting. Multiply by a Constant. We call the

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