GRE Sample Test 5 Quantitative Reasoning 1

Test different numbers that would satisfy the prompt. If x = $\frac{1}{2}$, then $\frac{1}{2^3}$ > $\frac{1}{2^5}$. Thus, $\frac{1}{2}$ is a possible value for x. In this case, Quantity A is greater. What about negative numbers? If x = −2, then ${\left(-2\right)}^3$ > ${\left(-2\right)}^5$. Thus, −2 is a possible value for x. In this case, Quantity B is greater.