<p>From Barron's 2009 (pg 105):</p>
<p>In the graph of parametric equations x=t^2+t, y=t^2-t</p>
<p>A. x >= 0
B. x >= -0.25
c. x is any real number
D. x >= -1
E. x =< 1</p>
<p>I get the answer as A, but the book says its B...</p>
<p>Though, Barron's DOES make a few mistakes in the answer key of the review section of the book (I think i counted 2-3 as i went through it), they are right on this one. If you graph it (make sure your Tmin is less than -.5) , you'll see that x=-0.25 when t is -0.5</p>
<p>-.5^2= .25
.25 - .5 = -.25</p>
<p>Ah dammit I had my Tmin set to 0! No wonder!</p>