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WGU C959: Discrete Math I (Unit 4) With Questions And 100% ALL SURE ANSWERS
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WGU C959: Discrete Math I (Unit 4) With Questions And 100% ALL SURE ANSWERS
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JACKLINEWGU C959: Discrete Math I (Unit 4) With Questions And
100% ALL SURE ANSWERS
Terms in this set (27)
Switch the rows and columns
Transpose of a matrix
Transpose of an identity matrix Same as the the identity matrix (no change)
# of columns of matrix A must be the same as the # of rows of matrix B; otherwise
undefined
Matrix multiplication size
(m n) (n p) = (m p)
Performed by multiplying the elements of each
row of the first matrix by the corresponding
elements (i.e. same index) of each column of the
Matrix multiplication process
second matrix. Add the products.
(Row-column rule)
A square matrix that has an inverse
Invertible matrix (nonsingular matrix)
If AB = BA = Identity matrix, A and B are inverse matrices
Singular matrix a square matrix that does not have an inverse
If a matrix has a row or column with all 0s? Matrix is singular
a matrix that contains only the coefficients of a
system of equations
Coefficient matrix
a coefficient matrix with an extra column
containing the constant terms
Augmented matrix
Transpose of a transpose (A^T)^T=A; reverts to same matrix
x = A^-1 * b
Solving matrix equations using inverse
matrices x = variables
b= constants
1. (Replacement) Replace one row by the sum of itself and a multiple of another row.
Elementary Row Operations 2. (Interchange) Interchange two rows
3. (Scaling) Multiply all entries in a row by a nonzero constant
1/2
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