Exponents Logarithms 8662C2
1. **Problem Statement:**
Solve the equation involving exponents and logarithms: $$2^{x} = 8$$ and find $x$.
2. **Formula and Rules:**
Recall that $a^{m} = a^{n}$ implies $m = n$ if $a > 0$ and $a \neq 1$.
Also, logarithms are the inverse of exponents: $$\log_{a}(a^{x}) = x$$.
3. **Step-by-step Solution:**
- Express 8 as a power of 2: $$8 = 2^{3}$$.
- So the equation becomes $$2^{x} = 2^{3}$$.
- Since the bases are equal and positive, set the exponents equal: $$x = 3$$.
4. **Using Logarithms:**
Alternatively, take the logarithm base 2 of both sides:
$$\log_{2}(2^{x}) = \log_{2}(8)$$
Using the logarithm power rule:
$$x \cdot \log_{2}(2) = \log_{2}(8)$$
Since $$\log_{2}(2) = 1$$, this simplifies to:
$$x = \log_{2}(8)$$
Calculate $$\log_{2}(8)$$:
Since $$8 = 2^{3}$$, $$\log_{2}(8) = 3$$.
5. **Final Answer:**
$$x = 3$$.
This example shows how to solve exponential equations by rewriting bases or using logarithms.