Question 911617
(Corrected):


You can try doing some of the work like this:


roots:  3 and  -1, so {{{(3+(-1))/2=1}}}.
Axis of symmetry is x=1, and ...


... y-coordinate for vertex:  {{{y=-(1-3)(1+1)=-(-2)*2=4}}}.
Vertex is (1,4).


The parabola has vertex (1,4) and opens downward, and has x-intercepts -1, and 3.


That is not all of the work for your question; but is most of it.