Question 1071431
Do you see two x values which give the same y value?  Look what is right in between.


<pre>
x	-2	-1	0	1	2

y	 1      0       1       4       9
</pre>

Vertex should likely be  (-1,0).
{{{y=a(x+1)^2+0}}}.


You can use either of two or three of the other points to help in finding the factor, "a".  Try the point  (1,4).


{{{a(x+1)^2=y}}}
{{{a=y/(x+1)^2}}}
{{{a=4/(1+1)^2}}}
{{{a=1}}}


Equation simply  {{{highlight(y=(x+1)^2)}}}