Determinants of Matrices

This lesson covers how to find the determinant of a 2x2 matrix using cross multiplication. It also explains the determinant of a 3x3 matrix using Kramer's rule and the co-factor technique.

• 00:02 “My name is John Obodo, and we are looking at today for the mathematics and we want to look at the topic matrices and determinants. So, and this area we are going to talk more on determinants. And the major thing we want...”
• 05:43 “So, let's solve this problem. Matrix A is given us 141, 2, 3, 0, 5, 1, 1. Determinant. To find the determinant of this matrix, we say the terminant A is equal to 1, OK, brackets, we have 30, 11, close the brackets, OK, w...”
• 04:03 “A 12, A 22, A 32, A 32. And they're A 13, A 12, sorry, A 23, and A 33. So, we pick the first value or the first position. And the rest of that, we say that is equal to plus A 11, determinants, A 22, A 32, and the A 23, A...”