Practicing Success
a b c d |
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\(A = \begin{bmatrix}1 & 2\\-1 & 3\end{bmatrix}\), \(B = \begin{bmatrix}4 & 0\\1 & 5\end{bmatrix}\), \(C = \begin{bmatrix}2 & 0\\1 & -2\end{bmatrix}\), \(AC = \begin{bmatrix}1 & 2\\-1 & 3\end{bmatrix}\begin{bmatrix}2 & 0\\1 & -2\end{bmatrix}\) \(AC = \begin{bmatrix}1 × 2 + 2 × 1 & 1 × 0 − 2 × 2\\-1 × 2 + 3 × 1 & −1 × 0 + 3 × (−2)\end{bmatrix}\) \(AC = \begin{bmatrix}4 & −4\\1 & −6\end{bmatrix}\) \(BC = \begin{bmatrix}4 & 0\\1 & 5\end{bmatrix} \begin{bmatrix}2 & 0\\1 & -2\end{bmatrix}\) \(BC = \begin{bmatrix}4 × 2 + 0 × 1 & 4 × 0 + 0 × (−2)\\1 × 2 + 5 × 1 & 1 × 0 + 5 × (−2)\end{bmatrix}\) \(BC = \begin{bmatrix}8 & 0\\7 & −10\end{bmatrix}\) \(AC − BC = \begin{bmatrix}−4 & −4\\−6 & 4\end{bmatrix}\)
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