What's the answer to this math question?

Test Preparation
1

<p><a href="http://i1053.photobucket.com/albums/s480/desuetudes/47.png%5B/url%5D"&gt;http://i1053.photobucket.com/albums/s480/desuetudes/47.png&lt;/a&gt;&lt;/p>

<p>Is it A, B, C, D, or E?</p>

2

<p>It has to be B, because whether positive or negative, it will still give a negative under the radical. 0 is the only one that can give a y value of zero so its B</p>

3

<p>B, because -x^2 is either 0 or negative for all real x. However a negative under the radical does not yield a real number.</p>