Answer:
The equation of the parabola is  , whose real vertex is
, whose real vertex is  , not
, not  .
.
Step-by-step explanation:
A parabola is a second order polynomial. By Fundamental Theorem of Algebra we know that a second order polynomial can be formed when three distinct points are known. From statement we have the following information:
 ,
,  ,
, 
From definition of second order polynomial and the three points described above, we have the following system of linear equations:
 (1)
 (1)
 (2)
 (2)
 (3)
 (3)
The solution of this system is:  ,
,  ,
,  . Hence, the equation of the parabola is
. Hence, the equation of the parabola is  . Lastly, we must check if
. Lastly, we must check if  belongs to the function. If we know that
 belongs to the function. If we know that  , then the value of
, then the value of  is:
 is:


 does not belong to the function, the real point is
 does not belong to the function, the real point is  .
.