While studying SAT MATH 2 , I tried to solve the following problem but faced some difficulty. The problem goes ........
In the graph of the parametric equations $x= t^2+t$ , $y=t^2-t$
A) $x\ge 0$
B) $x\ge -\frac{1}{4}$
The answer given in the book is as follows https://drive.google.com/file/d/0B8VKUxBBIaO2LTJlb1lTalcxQ1k/view?usp=sharing
Here starts the problem. When I graph the given parametric equations, my graph does not extend to the left of zero. According to the graph I obtained, the answer should be $x\ge0$. Here is a pic of the graph I obtained https://drive.google.com/file/d/0B8VKUxBBIaO2YzY0VVhrVFp6U2c/view?usp=sharing
So, I hereby kindly request someone to help me with this issue
the command "ParametricPlot[{t^2+t,t^2-t},{t,-1,1}]" shows the parabola like in your exercise book