Matrix Calculations (Matrix) - Casio fx-991ZA Plus User Manual

x x
2
2 – 3 – 6 = 0
N5(EQN)3(aX
2 =- 3 =- 6 ==
* The local minimum value is displayed when
is displayed when
– 2 ' 2
x
2
N5(EQN)3(aX
x x
3 2
– 2
N5(EQN)4(aX

Matrix Calculations (MATRIX)

Use the MATRIX Mode to perform calculations involving matrices of up to 3
rows by 3 columns. To perform a matrix calculation, you first assign data to
special matrix variables (MatA, MatB, MatC), and then use the variables in
the calculation as shown in the example below.
To assign
1 1
the following calculations:
2 1
+
1 1 –1 2
1. Press N6(MATRIX) to enter the MATRIX Mode.
2. Press 1(MatA)5(2×2).
• This will display the Matrix Editor for input
of the elements of the 2 × 2 matrix you
specified for MatA.
3. Input the elements of MatA: 2 = 1 = 1 = 1 =.
4. Perform the following key operation: 1 4 (MATRIX)2 (Data)
2(MatB)5(2×2).
• This will display the Matrix Editor for input of the elements of the 2 × 2
matrix you specified for MatB.
B
2
+ bX + c = 0)
c
c
c
a
0.
B
x
+ 2 = 0
2
+ bX + c = 0)
1 =- 2 ! 2 )= 2 ==
x
– + 2 = 0
3
+ bX
1 =- 2 =- 1 = 2 ==
2 1
to MatA and
1 1
2 –1
(MatA+MatB)
(X-Value Minimum=)*
(Y-Value Minimum=)*
a
2
+ cX + d = 0)
c
c
2 –1
to MatB, and then perform
–1 2
2 1 2 –1
×
1 1 –1 2
EN-32
(X =)
1
(X
2
0. The local maximum value
(MatA×MatB),
MAT MAT
"A" stands for "MatA".
3 + 57
4
3 – 57
=)
4
3
4
57
–
8
'
(X=)
2
(X =) –1
1
(X =) 2
2
(X =) 1
3