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<p>or if x is negative, then x^2 will be bigger.</p>
<p>As Quantmech said, “you cannot tell from the info” is one of the choices. </p>
<p>For people who are good at math, the cases you listed jump out at you and it doesn’t take any time to solve the problem. People who don’t have good intuition get tripped up by questions like those, however.</p>