Casio fx-9750G Manual page 21

Example To invert the following matrix :
Matrix A =
1(Mat)aA!X
w
This operation produces the following result.
–1
A =
• Only square matrices (same number of rows and columns) can be inverted. Try-
ing to invert a matrix that is not square produces an error (Dim ERROR).
• A matrix with a value of zero cannot be inverted. Trying to invert a matrix with
value of zero produces an error (Ma ERROR).
• Calculation precision is affected for matrices whose value is near zero.
• A matrix being inverted must satisfy the conditions shown below.
–1
A A = A
• The following shows the formula used to invert Matrix A into inverse matrix A
A =
A –1 =
k k k k k Squaring a Matrix
The following is the format for squaring a matrix.
Matrix
Mat A
Mat Z
MatAns
1 2
3 4
–2 1
1.5 –0.5
1 0
–1
A = E =
0 1
a b
c d
d –b
1
ad – bc
–c
x
Matrix Calculations
1 2 3 4 5 6
Note that ad – bc G 0.
a
w
6 - 4
–1 .
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