2. Let Maths take you Further…
FP2 (MEI) Matrices (part 1) The determinant and the inverse of a 3 by 3 matrix
Let Maths take you Further…

3. The determinant and the inverse of a 3 by 3 matrix
Before you start:
You need to have covered the work on matrices in FP1, particularly the work on determinants and inverses.
When you have finished… You should:
Know what is meant by the minor and the cofactor of an element of a matrix.
Be able to find the determinant of any 3 x 3 matrix.
Know simple properties of determinants (pages 87 – 89).
Be able to find the inverse of a non-singular 3 x 3 matrix.

4. Before we start...

5. Before we start...

6. Before we start...

7. The determinant of a 3×3 matrix

11. The determinant of a 3×3 matrix

13. The inverse of a 3×3 matrix

14. Example:

16. The inverse of a 3×3 matrix

18. Next time….. Matrices and Simultaneous Equations

19. The determinant and the inverse of a 3 by 3 matrix
When you have finished… You should:
Know what is meant by the minor and the cofactor of an element of a matrix.
Be able to find the determinant of any 3 x 3 matrix.
Know simple properties of determinants (pages 87 – 89).
Be able to find the inverse of a non-singular 3 x 3 matrix.

20. Independent study:
Using the MEI online resources complete the study plans for the two sections:
Matrices 1 & 2
Do the online multiple choice tests for these sections and submit your answers online.