1.

The new matrix after applying the elementary operation R2→2R2+3R1 on the matrix A=\(\begin{bmatrix}2&5&4\\5&2&6\\7&2&1\end{bmatrix}\) is _____________

A. \(\begin{bmatrix}2&5&4\\16&19&24\\7&2&1\end{bmatrix}\)
B. \(\begin{bmatrix}2&5&4\\19&19&24\\7&2&1\end{bmatrix}\)
C. \(\begin{bmatrix}2&-5&4\\16&19&24\\7&2&1\end{bmatrix}\)
D. \(\begin{bmatrix}1&5&4\\16&19&24\\7&2&1\end{bmatrix}\)
Answer» B.


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