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Matrix Revision

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Matrix Revision

5:00

4:30

4:00

3:30

3:00

2:30

2:00

1:30

1:00

0:30

TIME UP!!

35

32

8

Can’t do it!

-12 20

-60 88

5/17 -2/17

1/17 3/17

A

3x2

3 0

5 -5

0 -1

3 -5

3 6

-13 25

Can’t do it!

- Order of a matrix
- What does the order tell you when multiplying matrices?

- Zero matrix
- Identity matrix

- Briefly note down the buttons and functions you may need to use with matrices

- What are the two main notations used for the determinant?
- Pair up the following – no calculators!:

11

6

4

-31

- In what situations can the inverse be found?
- 2 x 2 by hand, 3 x 3 on GDC
- If AB = I what does that tell you about A and B?
- If CD = 5I, what is the inverse of D?

- AX = B. Make X the subject showing all lines of working clearly.
- Solve the following simultaneous equations using matrices and a GDC.

5, -20.6, -5.3, 3.9

- What is the important law that works with normal algebra and not matrix algebra?