The vertex formula:

The graph of 



has the vertex (, ), where 

Therefore


can be written as



So we apply the vertex formula:

, , , 

so the vertex is

(, ) =

(, ) = (, )

To find the y-intercept, we substitute 





So the y-intecept is (, ), which just happens
to, in this case, be the same point as the vertex.

To find the x-intercepts, we we substitute 





 = ±
 
Since the square root of 6 is about ,

the two x intercepts are about (, ) and (, )

So we plot those two points, as well as:

vertex: (, )

and

y-intercept: (, ) [Which in this case just 
happens to be the same point as the vertex.]



Edwin