Try the following ACT math practice question that tests your understanding of manipulating exponential expressions.

If $2^x = n$, what does $4^{x+1}$ equal in terms of $n$?

- $\quad 8n$
- $\quad 2n^2$
- $\quad 4n^2$
- $\quad n^2+4$
- $\quad 2n^2+8$

**Video Explanation**

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