Vertex (0,1) x intercepts is - 1 and 1 what is the equation of the parabola?

those are the vertex form of a parabola... so hmmm
the vertex of this one is at 0,1 and intercepts or "solutions" are at -1 and 1, so is opening downwards, notice the picture below

that means, the squared variable is the "x", thus the form is 

now, we know the vertex is at 0,1, and two x-intercepts of 

thus      

solve for "a", to see what that coefficient is, then plug it back in the vertex form equation

Maybe the answer is 20mm. all i really did was just multiply, which is obvious.

Idon’t exactly understand but i think dbc=rst