12. a. If there is an n x n matrix D such that AD = 1,...
12. a. If there is an n x n matrix D such that AD = 1, then there is also an n x n matrix C such that CA= 1.
b. If the columns of A are linearly independent, then the columns of A span Rn.
c. If the equation Ax = b has at least one solution for each bin Rn, then the solution is unique for each b.
d. If the linear transformation (x) -> Ax maps Rn into Rn, then A has n pivot positions.
e. If there is a b in Rn such that the equation Ax = b is inconsistent, then the transformation x -> Ax is not one- to-one.
Homework Answers
Let A be an nx n matrix. Select all of the following that are equivalent to...
Let A be an nx n matrix. Select all of the following that are equivalent to the statement: A is invertible. The homogeneous equation Ax-0 has a nontrivial solution. The echelon form of A has a pivot in every row and every column. The columns of A are linearly dependent For any vector b in R", Ax-b has a unique solution. The linear transformation x Ax is 1-1 and onto. A is nonsingular.
8. Let A be a 5 x 4 matrix such that its reduced row echelon form...
8. Let A be a 5 x 4 matrix such that its reduced row echelon form has 4 pivot positions (leading entries). Which of the following statements is TRUE? a) The linear transformation T : R4 → R5 defined by T(X) = AX is onto. b) AX = 0 has a unique solution. c) Columns of A are linearly dependent. d) AX b is consistent for every vector b in R
A.) if A is an m*n matrix, such that Ax=0 for every vector x in R^n, then A is the m * n Zero mat...
a.) if A is an m*n matrix, such that Ax=0 for every vector x in R^n, then A is the m * n Zero matrix b.) The row echelon form of an invertible 3 * 3 matrix is invertible c.) If A is an m*n matrix and the equation Ax=0 has only the trivial solution, then the columns of A are linearly independent. d.) If T is the linear transformation whose standard matrix is an m*n matrix A and the...
True/False: Give a brief justification for your answer a) If an m x n matrix A...
True/False: Give a brief justification for your answer a) If an m x n matrix A has a pivot position in each row, then the equation Ax=b has a unique solution for each b in R^m. b) If {u,v,w} is linearly independent, then u, v, w are not in R^2. c) If A is a 5 x 4 matrix, then the linear transformtion x -> Ax is not onto.
IT a) If one row in an echelon form for an augmented matrix is [o 0 5 o 0 b) A vector bis a linear combination of the columns of a matrix A if and only if the c) The solution set of Ai-b is the set o...
IT a) If one row in an echelon form for an augmented matrix is [o 0 5 o 0 b) A vector bis a linear combination of the columns of a matrix A if and only if the c) The solution set of Ai-b is the set of all vectors of the formu +vh d) The columns of a matrix A are linearly independent if the equation A 0has If A and Bare invertible nxn matrices then A- B-'is the...
Write each statement as True or False (a) If an (nx n) matrix A is not invertible then the linear system Ax-O hns infinitely many b) If the number of equations in a linear system exceeds the number o...
Write each statement as True or False (a) If an (nx n) matrix A is not invertible then the linear system Ax-O hns infinitely many b) If the number of equations in a linear system exceeds the number of unknowns then the system 10p solutions must be inconsistent ) If each equation in a consistent system is multiplied through by a constant c then all solutions to the new system can be obtained by multiplying the solutions to the original...
Plese help me!!!(Conditioning of Problems and Stability of Algorithms) IA is an m x n matrix, and x is an n x 1 vector,...
Plese help me!!!(Conditioning of Problems and
Stability of Algorithms)
IA is an m x n matrix, and x is an n x 1 vector, then the linear transformation У-Ax maps Rn to Rm, so the linear transformation should have a condition number, condAar (x). Assume that ||l is a subordinate norm. a. Show that we can define condAx (x) = 11All 11제/IAxl for every x 0.
IA is an m x n matrix, and x is an n x 1...
Determine if the matrix below is invertible. Use as few calculations as possible. Justify your answer....
Determine if the matrix below is invertible. Use as few calculations as possible. Justify your answer. 0 3 - 4 0 2 -4 -9 4 Choose the correct answer below. O A. The matrix is not invertible. If the given matrix is A, the equation Ax=b has at least one solution for each b in R3. OB. The matrix is invertible. The given matrix has 3 pivot positions. C. The matrix is invertible. The columns of the given matrix span...
Determine if the matrix below is invertible. Use as few calculations as possible. Justify your answer....
Determine if the matrix below is invertible. Use as few calculations as possible. Justify your answer. - 3 30 20 6 -40 9 Choose the correct answer below. O A. The matrix is invertible. The given matrix has 2 pivot positions. O B. The matrix is not invertible. If the given matrix is A, the columns of A do not form a linearly independent set. OC. The matrix is not invertible. If the given matrix is A, the equation Ax...
Currently workable: Suppose and m x n matrix A has n pivot columns. Prove why, for...
Currently workable: Suppose and m x n matrix A has n pivot columns. Prove why, for each b in R the equation Ax = b has at most one solution. + Drag and drop your files or click to browse...
Let A be an nx n matrix. Select all of the following that are equivalent to the statement: A is invertible. The homogeneous equation Ax-0 has a nontrivial solution. The echelon form of A has a pivot in every row and every column. The columns of A are linearly dependent For any vector b in R", Ax-b has a unique solution. The linear transformation x Ax is 1-1 and onto. A is nonsingular.
8. Let A be a 5 x 4 matrix such that its reduced row echelon form has 4 pivot positions (leading entries). Which of the following statements is TRUE? a) The linear transformation T : R4 → R5 defined by T(X) = AX is onto. b) AX = 0 has a unique solution. c) Columns of A are linearly dependent. d) AX b is consistent for every vector b in R
IT a) If one row in an echelon form for an augmented matrix is [o 0 5 o 0 b) A vector bis a linear combination of the columns of a matrix A if and only if the c) The solution set of Ai-b is the set of all vectors of the formu +vh d) The columns of a matrix A are linearly independent if the equation A 0has If A and Bare invertible nxn matrices then A- B-'is the...
Write each statement as True or False (a) If an (nx n) matrix A is not invertible then the linear system Ax-O hns infinitely many b) If the number of equations in a linear system exceeds the number of unknowns then the system 10p solutions must be inconsistent ) If each equation in a consistent system is multiplied through by a constant c then all solutions to the new system can be obtained by multiplying the solutions to the original...
Plese help me!!!(Conditioning of Problems and
Stability of Algorithms)
IA is an m x n matrix, and x is an n x 1 vector, then the linear transformation У-Ax maps Rn to Rm, so the linear transformation should have a condition number, condAar (x). Assume that ||l is a subordinate norm. a. Show that we can define condAx (x) = 11All 11제/IAxl for every x 0.
IA is an m x n matrix, and x is an n x 1...
Determine if the matrix below is invertible. Use as few calculations as possible. Justify your answer. 0 3 - 4 0 2 -4 -9 4 Choose the correct answer below. O A. The matrix is not invertible. If the given matrix is A, the equation Ax=b has at least one solution for each b in R3. OB. The matrix is invertible. The given matrix has 3 pivot positions. C. The matrix is invertible. The columns of the given matrix span...
Determine if the matrix below is invertible. Use as few calculations as possible. Justify your answer. - 3 30 20 6 -40 9 Choose the correct answer below. O A. The matrix is invertible. The given matrix has 2 pivot positions. O B. The matrix is not invertible. If the given matrix is A, the columns of A do not form a linearly independent set. OC. The matrix is not invertible. If the given matrix is A, the equation Ax...
Currently workable: Suppose and m x n matrix A has n pivot columns. Prove why, for each b in R the equation Ax = b has at most one solution. + Drag and drop your files or click to browse...
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