Solve Matrix Equation

Question

Solve the matrix equation: \[ [x\ \ 1] \begin{bmatrix} 1 & 0 \\ -2 & -3 \end{bmatrix} \begin{bmatrix} x \\ 5 \end{bmatrix} = 0 \]


Solution

Step 1: Single Matrix Equation

\[ [x\ \ 1] \begin{bmatrix} x \\ -2x – 15 \end{bmatrix} = x(x) + 1(-2x – 15) = 0 \]

Step 2: Simplify

\[ x^2 – 2x – 15 = 0 \]

Step 3: Solve

\[ (x – 5)(x + 3) = 0 \] \[ x = 5 \quad \text{or} \quad x = -3 \]

Final Answer

\[ x = 5 \quad \text{or} \quad x = -3 \]

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