1. The problem asks to express the number 8 in the form $2^x$. 2. Recall the definition: $2^x$ means 2 raised to the power of $x$. 3. We need to find $x$ such that $2^x = 8$. 4. Since $8 = 2 \times 2 \times 2 = 2^3$, we have $x = 3$. 5. Therefore, $8$ can be written as $2^3$. Final answer: $8 = 2^3$.