Realuzar speraciones \( A=\left[\begin{array}{cc}2 & 1 \\ 3 & -3\end{array}\right] B=\left[\begin{array}{cc}-6 & 5 \\ 2 & -3\end{array}\right] \) \( A^{2}-B^{2} \)
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Para calcular \( A^{2} - B^{2} \), primero necesitamos encontrar \( A^{2} \) y \( B^{2} \). Calculamos \( A^{2} \): \[ A^{2} = A \cdot A = \left[\begin{array}{cc}2 & 1 \\ 3 & -3\end{array}\right] \cdot \left[\begin{array}{cc}2 & 1 \\ 3 & -3\end{array}\right] = \left[\begin{array}{cc}(2 \cdot 2 + 1 \cdot 3) & (2 \cdot 1 + 1 \cdot -3) \\ (3 \cdot 2 + -3 \cdot 3) & (3 \cdot 1 + -3 \cdot -3)\end{array}\right] = \left[\begin{array}{cc}7 & -1 \\ -3 & 12\end{array}\right] \] Ahora, calculamos \( B^{2} \): \[ B^{2} = B \cdot B = \left[\begin{array}{cc}-6 & 5 \\ 2 & -3\end{array}\right] \cdot \left[\begin{array}{cc}-6 & 5 \\ 2 & -3\end{array}\right] = \left[\begin{array}{cc}(-6 \cdot -6 + 5 \cdot 2) & (-6 \cdot 5 + 5 \cdot -3) \\ (2 \cdot -6 + -3 \cdot 2) & (2 \cdot 5 + -3 \cdot -3)\end{array}\right] = \left[\begin{array}{cc}36 + 10 & -30 - 15 \\ -12 - 6 & 10 + 9\end{array}\right] = \left[\begin{array}{cc}46 & -45 \\ -18 & 19\end{array}\right] \] Finalmente, resta \( A^{2} - B^{2} \): \[ A^{2} - B^{2} = \left[\begin{array}{cc}7 & -1 \\ -3 & 12\end{array}\right] - \left[\begin{array}{cc}46 & -45 \\ -18 & 19\end{array}\right] = \left[\begin{array}{cc}(7 - 46) & (-1 + 45) \\ (-3 + 18) & (12 - 19)\end{array}\right] = \left[\begin{array}{cc}-39 & 44 \\ 15 & -7\end{array}\right] \] Por lo tanto, \( A^{2} - B^{2} = \left[\begin{array}{cc}-39 & 44 \\ 15 & -7\end{array}\right] \).