Questão 3569306

\(\begin{bmatrix} b_{1} & -b\\ -b & b_{2} \end{bmatrix}\)

\(\begin{bmatrix} b & -b_{1}\\ -b_{2} & b \end{bmatrix}\)

\(\begin{bmatrix} (b+b_{1}) & -b\\ -b & (b_{2}+b) \end{bmatrix}\)

\(\begin{bmatrix} (b+b_{1}) & 0\\ 0 & (b_{2}+b) \end{bmatrix}\)

\(\begin{bmatrix} (b+b_{1}) & -(b_{1}+b_{2})\\ -(b_{1}+b_{2}) & (b_{2}+b) \end{bmatrix}\)