Algebra 3-4 Formulas

Slope : m=y2-y1/x2-x1

Point slope form : y-y1=m(x-x1)

Quadratic formula :

X-coordinate of the vertex : x=-b/2a

Explicit Geometric : an=a1(r)^n-1

Arithmetic series : Sn= n/2)(a1+an)