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Composing 3x3 matrices (video) | Matrices | Khan Academy
3X3 matrices can define transformations of the 3D space. In this worked example, we see how to find the matrix transformation that is the composition of two other matrices.
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Sal shows the standard method for finding the determinant of a 3x3 matrix. Created by Sal Khan.
Intro to matrix inverses (video) | Matrices | Khan Academy
We've learned about matrix addition, matrix subtraction, matrix multiplication. So you might be wondering, is there the equivalent of matrix division? And before we get into that, let me introduce some concepts to you.
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Unit 2: Matrix transformations - Math | Khan Academy
Linear transformation examples: Scaling and reflections. Linear transformation examples: Rotations in R2. Rotation in R3 around the x-axis. Unit vectors. Introduction to projections. Expressing a projection on to a line as a matrix vector prod.
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Determinant of a 3x3 matrix: shortcut method (2 of 2) (video)
Course: Algebra (all content) > Unit 20. Lesson 15: Determinants & inverses of large matrices. Determinant of a 3x3 matrix: standard method (1 of 2) Determinant of a 3x3 matrix: shortcut method (2 of 2) Determinant of a 3x3 matrix. Inverting a 3x3 matrix using Gaussian elimination.
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Math: Pre-K - 8th grade; Pre-K through grade 2 (Khan Kids) Early math review; 2nd grade; 3rd grade; 4th grade; 5th grade; 6th grade; 7th grade; 8th grade; 3rd grade math (Illustrative Math-aligned)
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