[math: U=[110234]V=[31]W=[0.60.50.40.5]X=[3546]Y=[132056001]]U = \left[ {\begin{array}{*{20}{c}}1&1&0\2&3&4\end{array}} ight]\,\,\;\quad V = \left[ {\begin{array}{*{20}{c}}3\1\end{array}} ight]\,\,\;\quad W = \left[ {\begin{array}{*{20}{c}}{0.6}&{0.5}\{0.4}&{0.5}\end{array}} ight]\;\,\,\;X = \left[ {\begin{array}{*{20}{c}}3&5\4&6\end{array}} ight]\quad \,\, \ Y = \left[ {\begin{array}{*{20}{c}}1&3&2\0&5&6\0&0&1\end{array}} ight]\;\quad The upper triangular matrix is:

Question

[math: U=[110234]V=[31]W=[0.60.50.40.5]X=[3546]Y=[132056001]]U = \left[ {\begin{array}{*{20}{c}}1&1&0\2&3&4\end{array}} ight]\,\,\;\quad V = \left[ {\begin{array}{*{20}{c}}3\1\end{array}} ight]\,\,\;\quad W = \left[ {\begin{array}{*{20}{c}}{0.6}&{0.5}\{0.4}&{0.5}\end{array}} ight]\;\,\,\;X = \left[ {\begin{array}{*{20}{c}}3&5\4&6\end{array}} ight]\quad \,\, \ Y = \left[ {\begin{array}{*{20}{c}}1&3&2\0&5&6\0&0&1\end{array}} ight]\;\quad The upper triangular matrix is:

BlackTom AI · Accepted Answer

To determine which matrix is upper triangular, we evaluate the structure of each given matrix and check where zeros appear.
Option analysis:
- U = [[1, 1, 0], [2, 3, 4]]: This is a 2x3 matrix and not a square matrix. Upper triangular matrices are defined for square matrices where all entries below the main diagonal are zero. Since U is not square, it cannot be classified as upper triangular in the standard sense.
- V = [[3], [1]]: This is a 2x1 column vector. Again, the usual definition of an upper triangular matrix applies to square matrices; thus V does not fit the concept of an upper triangular matrix.
- W = [[0.6, 0.5], [0.4, 0.5]]: This is a 2x2 matrix, which could be upper triangular if the entry below the main diagonal (the (2,1) position) were zero. However, W has a 0.4 in the position (2,1), which is below the diagonal and nonzero, so it is not upper triangular.
- X = [[3, 5], [4, 6]]: This 2x2 matrix has a nonzero entry below the diagonal at (2,1) = 4. Therefore, it is not upper triangular.
- Y = [[1, 3, 2], [0, 5, 6], [0, 0, 1]]: This is a 3x3 square matrix, and all entries below the main diagonal are zero (the positions (2,1) and (3,1) and (3,2) are 0). This matches the definition of an upper triangular matrix.
Thus, among the given matrices, Y is the only one that satisfies the upper triangular property. The other options fail because they are either non-square or contain nonzero entries below the main diagonal, which violates the definition of an upper triangular matrix.

MCD1550 / MCD2140 - T3 - 2024 11.6 Week 11: In Class - Part B

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