Casio fx-9750G Matrix Calculations - Manual (Page 21)

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Example To invert the following matrix :
Matrix A =
1 2
3 4
1 (Mat) aA!X
w
This operation produces the following result.
A –1 =
–2 1
1.5 –0.5
• 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.
A A –1 = A –1 A = E =
1 0
0 1
• The following shows the formula used to invert Matrix A into inverse matrix A –1 .
A =
a b
c d
A –1 =
1
d –b
ad – bc –c a Note that ad – bc G 0.
k k k k k Squaring a Matrix
The following is the format for squaring a matrix.
Matrix
Mat A
x w
Mat Z
MatAns
1 2 3 4 5 6
Matrix Calculations
6 - 4