[All Steps] Are the following subspaces of the 2 * 2 matrices? Justify your answer. The matrices [lla b , c d] with a+b+c+d=0. The matrices of the form
Question: Are the following subspaces of the \(2 \times 2\) matrices? Justify your answer.
- The matrices \(\left[\begin{array}{ll}a & b \\ c & d\end{array}\right]\) with \(a+b+c+d=0\).
- The matrices of the form \(\left[\begin{array}{rr}a & 0 \\ -a & 0\end{array}\right]\)
- The \(2 \times 2\) matrices \(A\) with \(\operatorname{det} A=0\).
- The \(1 \times 2\) matrices.
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