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.