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Avaluate \( \left(\begin{array}{cc}3 & -2 \\ -7 & 5\end{array}\right)+2\left(\begin{array}{cc}-2 & 4 \\ 3 & -1\end{array}\right) \)

Ask by Bush Daniel. in Nigeria
Jan 22,2025

Real Tutor Solution

Tutor-Verified Answer

Answer

The result is the matrix \(\begin{pmatrix} -1 & 6 \\ -1 & 3 \end{pmatrix}\).

Solution

Calculate or simplify the expression \( \left(\begin{array}{cc}3 & -2 \\ -7 & 5\end{array}\right)+2\left(\begin{array}{cc}-2 & 4 \\ 3 & -1\end{array}\right) \). Matrices by following steps: - step0: Solution: \(\left[\begin{array}{rr}{3}&{-2}\\{-7}&{5}\end{array}\right]+2\times \left[\begin{array}{rr}{-2}&{4}\\{3}&{-1}\end{array}\right]\) - step1: Multiply the terms: \(\left[\begin{array}{rr}{3}&{-2}\\{-7}&{5}\end{array}\right]+\left[\begin{array}{rr}{-4}&{8}\\{6}&{-2}\end{array}\right]\) - step2: Evaluate: \(\left[\begin{array}{rr}{3-4}&{-2+8}\\{-7+6}&{5-2}\end{array}\right]\) - step3: Evaluate: \(\left[\begin{array}{rr}{-1}&{6}\\{-1}&{3}\end{array}\right]\) The result of the matrix addition is: \[ \begin{pmatrix} -1 & 6 \\ -1 & 3 \end{pmatrix} \]

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The Deep Dive

First, let's calculate \( 2\left(\begin{array}{cc}-2 & 4 \\ 3 & -1\end{array}\right) \): \[ 2\left(\begin{array}{cc}-2 & 4 \\ 3 & -1\end{array}\right) = \begin{array}{cc} 2 \cdot -2 & 2 \cdot 4 \\ 2 \cdot 3 & 2 \cdot -1 \end{array} = \begin{array}{cc} -4 & 8 \\ 6 & -2 \end{array} \] Now, we will add this result to \( \left(\begin{array}{cc}3 & -2 \\ -7 & 5\end{array}\right) \): \[ \left(\begin{array}{cc}3 & -2 \\ -7 & 5\end{array}\right) + \begin{array}{cc} -4 & 8 \\ 6 & -2 \end{array} = \begin{array}{cc} 3 + (-4) & -2 + 8 \\ -7 + 6 & 5 + (-2) \end{array} \] Calculating each element: 1. \( 3 - 4 = -1 \) 2. \( -2 + 8 = 6 \) 3. \( -7 + 6 = -1 \) 4. \( 5 - 2 = 3 \) Putting it all together, we get: \[ \begin{array}{cc} -1 & 6 \\ -1 & 3 \end{array} \] So, the final evaluated matrix is \[ \left(\begin{array}{cc} -1 & 6 \\ -1 & 3 \end{array}\right) \]

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