2.2 Introduction to Matrices notes.pdf - Introduction to...

This preview shows page 1 - 2 out of 2 pages.

2.2 Introduction to Matrices (1) Adding & Subtracting Matrices: To add/subtract matrices, the matrices must have the same dimensions. Then just add or subtract the corresponding entries. 2 3 −5 −1 0 4 - 0 1 3 3 −2 −1 2 −1 7 + [ 4 0 −6 ] 3 3 9 −5 - 2 0 −3 5 (2) Scalar Multiplication: To multiply a matrix by a scalar (a real #), multiply each entry of the matrix by the scalar. 3 −2 0 4 −7 2 6 −2 6 3 - 5 1 −3 7 5 (3) Multiplying Matrices: The product of two matrices A and B (A B) is defined only if the # of columns in A is equal to the # of rows in B. Matrix multiplication is not commutative. If A = 3 1 −2 0 0 3 and B = 4 3 2 0 , find AB: If C = 4 1 0 −2 and D = −4 −3 1 2 , find CD:

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture