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To multiply matrices A = {{a11,a12},{a21,a22}} and B = {{b11,b12},{b21,b22}}, the new matrix is of size 2x2, and the top left entry = ((a11 x b11) + (a12 x b21)), the top right entry = ((a11 x b12) + (a12 x b22)), and so on.. I recommend watching a youtube video or something, I can't give the answer...
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Linear Algebra Foundations #3- Matrix Multiplication
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To multiply matrices A = {{a11,a12},{a21,a22}} and B = {{b11,b12},{b21,b22}}, the new matrix is of size 2x2, and the top left entry = ((a11 x b11) + (a12 x b21)), the top right entry = ((a11 x b12) + (a12 x b22)), and so on.. I recommend watching a youtube video or something, I can't give the answer...