## Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

$\text{Exact: }\dfrac{\ln 10}{\ln 2}$ $\text{Approximately: } 3.322$
Note that $a^y = b \text{ is equivalent to } y = \log_a b$. Thus, $2^{x}=10 \longrightarrow x = \log_2 10$ Recall: Change of Base Formula: $\hspace{20pt} \log_ a M = \dfrac{\log_b M}{\log_b a}$ Therefore, $x=\log_2 10 \\\\ x = \boxed{\dfrac{\ln 10}{\ln 2} \approx 3.322}$