Learn How to Multiply Matrices
By Deb Russell, About.com Guide
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To find c21, we use row 2 of matrix A, and column 1 of matrix B, and for c22, we use row 2 of matrix A, and column 2 of matrix B. Notice a pattern? That’s right, the subscripts on the element variable tell you which row and column to use from the matrices. Following this pattern, matrix C looks like the image.