Matrix problems, F f f 2 2, A j 1 – Casio fx-570MS User Manual
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Matrix Problems
( fx-570MS/fx-991MS only)
Determine X
2
– Y
2
for two 2
× 2 matrices named X and Y
when X + Y =
3 2
3 –1
and X – Y =
1 –4
7 1
.
Matrix multiplication normally does not follow the commutative law XY = YX.
Consequently, (X + Y) (X – Y) = X
2
– XY + YX – Y
2
must be used.
1
.
Select the MAT Mode.
F F F 2
2
.
Specify the matrix name, and the number of rows and columns, and then input its elements.
For this problem, we need to input X + Y into Matrix A and X – Y into Matrix B.
The following shows input of the elements of Matrix A.
• Specify Matrix A.
A j 1
(Dim)
1
(A)
• Specify 2 for the number of rows (m).
2
=
• Specify 2 for the number of columns (n).
2
=
Example 1
Example 1
Explanation
Explanation
Operation