# Matrix multiplication

4 videos
3 skills
You know what a matrix is, how to add them and multiply them by a scalar. Now we'll define multiplying one matrix by another matrix. The process may seem bizarre at first (and maybe even a little longer than that), but there is a certain naturalness to the process. When you study more advanced linear algebra and computer science, it has tons of applications (computer graphics, simulations, etc.)

### Matrix multiplication introduction

VIDEO 6:26 minutes

### Multiplying a matrix by a matrix

VIDEO 5:30 minutes

### Multiplying a matrix by a matrix

PRACTICE PROBLEMS
Multiply two matrices

### Multiplying a matrix by a column vector

VIDEO 3:57 minutes

### Multiplying a matrix by a vector

PRACTICE PROBLEMS
Multiply a matrix by a vector

### Defined and undefined matrix operations

VIDEO 3:32 minutes

### Defined and undefined matrix operations

PRACTICE PROBLEMS
Determine whether the addition, subtraction, or multiplication of two matrices is defined