Casio fx-115ES PLUS - Manual (Page 38)

E-37
x 3 – 2 x 2 – x + 2 = 0
N5(EQN)4(aX
3 + bX
2
+ cX + d = 0)
1
=- 2 =- 1 = 2 == (X
1
=) –1
c (X
2
=) 2
c (X
3
=) 1
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
2 1
1 1
to MatA and
2 –1
–1 2
to MatB, and then perform
the following calculations:
×
2 1
1 1 2 –1
–1 2
(MatA×MatB),
+
2 1
1 1 2 –1
–1 2
(MatA+MatB)
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.
“A” stands 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.
5. Input the elements of MatB: 2
=- 1 =- 1 = 2 =.
6. Press
A to advance to the calculation screen, and perform the first
calculation (MatA
×MatB): 14(MATRIX)3(MatA)*14(MATRIX)
4(MatB)=.
• This will display the MatAns screen with the calculation results.
“Ans” stands for
“MatAns”.
Note: “MatAns” stands for “Matrix Answer Memory”. See “Matrix Answer
Memory” for more information.
7. Perform the next calculation (MatA+MatB):
A 1 4 (MATRIX)
3(MatA)+14(MATRIX)4(MatB)=.
1 1
MAT MAT
→
MAT MAT
→
MAT MAT
→
MAT MAT
→
MAT MAT