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Section 7.4 Matrix Algebra

Section 7.4 Matrix Algebra.

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Section 7.4 Matrix Algebra

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  1. Section 7.4 Matrix Algebra

  2. If A and B are both m×n matrices then the sum of A and B, denoted A + B, is a matrix obtained by adding correspondingentries of A and B. The difference of A and B, denoted A - B, is obtained by subtracting correspondingentries of A and B.

  3. The Zero Matrix

  4. If A is an m×n matrix and s is a scalar, then we let kA denote the matrix obtained by multiplying every element of A by k. This procedure is called scalar multiplication.

  5. AB ≠ BA

  6. Section 7.6 Solutions of Linear Systems by Matrix Inverses

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