Matrix Maths

Adding and subtracting with matrices is as simple as it is with normal numbers, the only prerequisite is that both matrices involved are of the same size (2×2, 3×3 etc.). In a nutshell, you just have to add or subtract each individual element of each matrix, creating a third matrix. If this isn’t clear enough, here are a couple of examples, where A and B are both 2×2 sized matrices:

If we are asked to calculate A + B, we simply add the individual elements of each matrix:

Similarly, the same operations can be used when subtracting one matrix from another. Just add or subtract the numbers that appear in the same position in each of the matrices.

Remember: Only Add/Subtract Matrices of the same dimensions!

Anything not clear or confusing you? Hit me up in the comments.

Welcome to the Matrix-Maths blog – we will shortly be educating you in both the basics and the more advanced theories of matrices (and determinants). For now, sit tight – if you can’t control yourself, subscribe to the RSS feed so you ensure you’re the first to know when new content is available!