1. **State the problem:**
We need to evaluate the matrix product and simplify the expression:
$$\left(\begin{array}{cc} b^{\alpha} & a_{b_{\alpha}}^{-1} \end{array}\right) \left(\begin{array}{c} 4 \ln c - 3 \end{array}\right) = -3 \ln e \cdot -1 \ln \left(\frac{q}{b_s}\right)$$
2. **Understand the matrix multiplication:**
The first matrix is a 1x2 row vector and the second is a 1x1 column vector, which is not conformable for multiplication. Likely, the second matrix should be a 2x1 column vector for multiplication to be valid. Assuming the second matrix is a 2x1 vector with entries $4 \ln c$ and $-3$:
$$\left(\begin{array}{cc} b^{\alpha} & a_{b_{\alpha}}^{-1} \end{array}\right) \left(\begin{array}{c} 4 \ln c \\ -3 \end{array}\right)$$
3. **Matrix multiplication formula:**
$$\text{Result} = b^{\alpha} \cdot (4 \ln c) + a_{b_{\alpha}}^{-1} \cdot (-3)$$
4. **Simplify the expression:**
$$= 4 b^{\alpha} \ln c - 3 a_{b_{\alpha}}^{-1}$$
5. **Simplify the right side:**
Recall $\ln e = 1$, so:
$$-3 \ln e \cdot -1 \ln \left(\frac{q}{b_s}\right) = -3 \cdot 1 \cdot -1 \ln \left(\frac{q}{b_s}\right) = 3 \ln \left(\frac{q}{b_s}\right)$$
6. **Equate both sides:**
$$4 b^{\alpha} \ln c - 3 a_{b_{\alpha}}^{-1} = 3 \ln \left(\frac{q}{b_s}\right)$$
This is the simplified form of the given expression.
**Final answer:**
$$4 b^{\alpha} \ln c - 3 a_{b_{\alpha}}^{-1} = 3 \ln \left(\frac{q}{b_s}\right)$$
Matrix Logarithm 98F899
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