general formula
y=ax? +bx+c
As we all know, this formula is used at any three points of a parabola.
2.
Vertex type
y=a(x-h)? +k
This formula is used when the coordinates of parabola vertices are known.
3.
Intersection formula
y=a(x-x 1)(x-x2)
It is known that the two intersections of parabola and X axis use this formula.