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# How Do You Find the Determinant of a 2x2 Matrix?

To find the determinant of a 2 by 2 matrix, first multiply the diagonal elements and the off-diagonal elements together. The diagonal elements of a 2 by 2 matrix are in the upper left-hand corner and the lower right-hand corner. Then, subtract the product of the off-diagonal elements from the product of the diagonal elements. This quantity is the determinant.

Continue ReadingThe determinant of a matrix is one method to find out if the matrix is invertible. If the determinant of a matrix A is not equal to zero, then A is invertible; likewise, if the determinant is equal to zero, then A is not invertible.

Calculating the determinant of a 3 by 3 matrix is more difficult than calculating for a 2 by 2 matrix, but the calculation can be done by hand. For larger matrices, the determinant is calculated using the property that the determinant of a diagonal matrix is equal to or the product of the elements on the diagonal. Using row and column permutations, transform the original matrix into a triangular matrix, and calculate the triangular determinant. The determinant of the original matrix is this triangular determinant multiplied by -1 for each time two rows were interchanged and by any constants that multiplied rows during the transformation.

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## How Do You Explain a Triangular Matrix and Its Use?

A: A triangular matrix is a special form of square matrix and can be either an upper triangular matrix or a lower triangular matrix. An upper triangular matri... Full Answer >Filed Under: -
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## What Is Nilpotent Matrix?

A: A nilpotent matrix is a square matrix with eigenvalues that are equal to zero. In general terms, this means that N ^ K = 0, where N is the square matrix, K... Full Answer >Filed Under: -
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## What Is a Unitary Matrix?

A: A unitary matrix is a matrix that when multiplied by its complex conjugate transpose matrix, equals the identity matrix. This implies that the complex conj... Full Answer >Filed Under: -
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## What Is the Inverse of 2x2 Matrix?

A: The inverse of a 2x2 matrix is the matrix that results in the identity matrix when multiplied by the first matrix. The values for the inverse of a 2x2 matr... Full Answer >Filed Under: