Solve Exponential A7C186
1. **State the problem:** Solve the equation $3x2^x=1$ for $x$.
2. **Rewrite the equation:** The equation is $3x2^x=1$.
3. **Isolate the exponential term:** Divide both sides by 3 to get
$$x2^x=\frac{1}{3}$$
4. **Analyze the equation:** This is a transcendental equation involving both $x$ and $2^x$. It cannot be solved algebraically using elementary functions.
5. **Use numerical methods or graphing:** To find $x$ such that $x2^x=\frac{1}{3}$, we can try values or use a graph.
6. **Check some values:**
- For $x=0$, $0\cdot2^0=0$ (too small)
- For $x=0.2$, $0.2\cdot2^{0.2}\approx0.2\cdot1.1487=0.2297$ (still less than $1/3$)
- For $x=0.3$, $0.3\cdot2^{0.3}\approx0.3\cdot1.231=0.3693$ (slightly greater than $1/3$)
7. **By interpolation, the solution is near $x\approx0.28$**.
**Final answer:** $x\approx0.28$