# 10_5 - Section 10.5 Matrix Algebra Instructor Ms Hoa...

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Section 10.5: Matrix Algebra Instructor: Ms. Hoa Nguyen ([email protected]) 1 Matrix order A matrix with m rows and n columns is said to be an m × n matrix, and of order m × n . 2 Adding and Subtracting Matrices Only matrices with the same order can be added and subtracted. Matrices are added and subtracted term by term, i.e., each entry of one matrix is added or subtracted to the equivalent entry (same row, same column) of the other matrix. Some properties : A + B = B + A A + ( B + C ) = ( A + B ) + C ( k + h ) A = kA + hA k ( A + B ) = kA + kB where A, B, C are matrices with the same rank, and k, h are numbers. 3 Multiplication of Matrices To multiply matrix A with matrix B , the number of columns in A must be the same as the number of rows in B . It means that, matrix multiplication AB is deﬁned if A is a m × n matrix and B is a n × k matrix. The entry at column i and row j of AB is the product of the row i of A and the column j of B . Since the row i of A ( R = ( r

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## This note was uploaded on 05/23/2011 for the course MAC 1147 taught by Professor Nuegyen during the Spring '11 term at FSU.

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10_5 - Section 10.5 Matrix Algebra Instructor Ms Hoa...

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