The following GMAT Problem Solving question tests your understanding of how to recognize algebraic identities and to manipulate exponent terms.

**Question 16**:

If $8^{2x}+8^{x}=0.75$, then $x=$

- $\quad -\dfrac{1}{4}$
- $\quad -\dfrac{1}{3}$
- $\quad -\dfrac{1}{2}$
- $\quad -\dfrac{2}{3}$
- $\quad -\dfrac{3}{4}$

**Video Explanation**