1. **State the problem:** Solve the equation $$\log_3 \sqrt{x} = \frac{1}{2 \log_3 x} + \log_3 (4x^2)$$ where $$x > 0$$.
2. **Recall logarithm properties:**
- $$\log_b (a^c) = c \log_b a$$
- $$\sqrt{x} = x^{1/2}$$
- The domain requires $$x > 0$$.
3. **Rewrite terms using properties:**
- Left side: $$\log_3 \sqrt{x} = \log_3 x^{1/2} = \frac{1}{2} \log_3 x$$
- Right side: $$\log_3 (4x^2) = \log_3 4 + \log_3 x^2 = \log_3 4 + 2 \log_3 x$$
4. **Substitute into the equation:**
$$\frac{1}{2} \log_3 x = \frac{1}{2 \log_3 x} + \log_3 4 + 2 \log_3 x$$
5. **Let $$y = \log_3 x$$ (note $$y \neq 0$$ because $$\log_3 x$$ in denominator):**
$$\frac{1}{2} y = \frac{1}{2y} + \log_3 4 + 2y$$
6. **Multiply both sides by $$2y$$ to clear denominators:**
$$2y \cdot \frac{1}{2} y = 2y \cdot \frac{1}{2y} + 2y \cdot \log_3 4 + 2y \cdot 2y$$
Simplify:
$$y^2 = 1 + 2y \log_3 4 + 4y^2$$
7. **Bring all terms to one side:**
$$y^2 - 4y^2 - 2y \log_3 4 - 1 = 0$$
Simplify:
$$-3y^2 - 2y \log_3 4 - 1 = 0$$
Multiply entire equation by $$-1$$:
$$3y^2 + 2y \log_3 4 + 1 = 0$$
8. **Solve quadratic equation:**
$$3y^2 + 2y \log_3 4 + 1 = 0$$
Use quadratic formula:
$$y = \frac{-2 \log_3 4 \pm \sqrt{(2 \log_3 4)^2 - 4 \cdot 3 \cdot 1}}{2 \cdot 3}$$
Calculate discriminant:
$$\Delta = (2 \log_3 4)^2 - 12 = 4 (\log_3 4)^2 - 12$$
Since $$\log_3 4 \approx 1.2619$$,
$$\Delta \approx 4 (1.2619)^2 - 12 = 4 (1.591) - 12 = 6.364 - 12 = -5.636 < 0$$
9. **Discriminant is negative, so no real solutions for $$y$$.**
10. **Check domain and denominator:** Since $$y = \log_3 x$$ and denominator $$2 \log_3 x$$ cannot be zero, $$y \neq 0$$.
11. **Conclusion:** No real $$y$$ satisfies the equation, so no real $$x > 0$$ solves the original equation.
**Final answer:** No real solution for $$x > 0$$.
Logarithmic Equation 53F9Ba
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