Casio fx-CG50 field manual for IB Math
Matrix arithmetic
Store two matrices and evaluate a matrix expression such as A3B on the calculation screen.
Given A=[1321] and B=[2103], find A3B.
In Run-Matrix, press (▶MAT/VCT) to open the matrix editor. With Mat A highlighted press (DIM) and enter 2 then 2 for a 2 x 2 matrix. Type the entries 1, 2, 3, 1, pressing after each value, then .
Move down to Mat B and define it the same way, (DIM) then 2, 2, with the entries 2, 0, 1, 3. Press twice to get back to the Run-Matrix entry line.
On the entry line, insert the matrix name with → (MAT/VCT) → (Mat), then for A. Press for the cube, press , insert Mat B the same way ( gives B), and press .
A3B=[56735457].
Your turn
Work each one on your calculator, then check the answer.
- 1
Given A=[2111] and B=[1230], find A3B.
- 2
Given A=[12−10] and B=[3012], find A3B.
- 3
Given A=[0121] and B=[2310], find A3B.