Let A be a 4 x 4 matrix. 1. Give a 4 x 4 matrix M that may be used to perform the row operation -5R3 R3 - 2. Give a 4 x 4 matrix N that may be used to perform the row operation R3 R4 - 3. Use matrix multiplication to describe the matrix obtained by applying R3 and then R3 R4 to A (note the order). -5R3

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