## Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Parabolas are conic sections that are obtained by slicing cones. If the equation of the parabola is of the form, $y=a{{\left( x-h \right)}^{2}}+k$ or $x=a{{\left( y-k \right)}^{2}}+h$, then the vertex of the parabola is $\left( h,k \right)$. A vertex of the parabola is the lowest or highest point and it is the point where the direction of the parabola changes. The correct option for the blank is “vertex”.