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  1. Matrices: FAQ (article) | Rank of a matrix | Khan Academy

    What is a matrix? A matrix is a rectangular array of numbers arranged in rows and columns. Matrices can be useful for organizing and manipulating data. They can also be used as a tool …

  2. Matrix addition & subtraction (article) | Khan Academy

    What you should be familiar with before taking this lesson A matrix is a rectangular arrangement of numbers into rows and columns. Each number in a matrix is referred to as a matrix element …

  3. Multiplying matrices by scalars (video) | Khan Academy

    Now that we know what a matrix is, let's see if we can start to define some operations on matrices. So let's say I have the 2 by 3 matrix, so two rows and three columns, and the entries …

  4. Intro to matrix multiplication (video) | Khan Academy

    A graph represents a single function, from x onto y. A matrix holds a lot more information than that. Matrices perform transformations on the entire space they act upon, so I'm not …

  5. Matrices: FAQ (article) - Khan Academy

    What is a matrix? A matrix is a rectangular array of numbers arranged in rows and columns. Matrices can be useful for organizing and manipulating data. They can also be used as a tool …

  6. Solving linear systems with matrices (video) | Khan Academy

    We use matrices to represent functions or trasformations. We care about finding the inverse of a matrix for the same reason we care about finding the inverse of a function.

  7. Intro to identity matrix (video) | Khan Academy

    Identity matrices are useful in a variety of applications in mathematics, engineering, and computer science. Here are a few examples: In linear algebra, identity matrices are used to represent …

  8. Properties of matrix multiplication (article) | Khan Academy

    Well, a matrix is defined when the number of columns of the first matrix is equal to the number of rows of the second matrix. For example, let A, B be two matrices.

  9. Khan Academy | Free Online Courses, Lessons & Practice

    Created by experts, Khan Academy’s library of trusted, standards-aligned practice and lessons covers math K-12 through early college, grammar, science, history, AP®, SAT®, and more.

  10. Interpreting determinants in terms of area - Khan Academy

    The determinant of a 2X2 matrix tells us what the area of the image of a unit square would be under the matrix transformation. This, in turn, allows us to tell what the area of the image of …