What is the the vertex of #y = (x + 3)^2-9 #? Algebra Quadratic Equations and Functions Quadratic Functions and Their Graphs 1 Answer Konstantinos Michailidis Feb 27, 2016 This has a vertex at #x=-3# hence its vertex is at #(-3,-9)# The quadratic equation in form #y=a*(x-h)^2+k# has a vertex at #(h,k)# Answer link Related questions What are the important features of the graphs of quadratic functions? What do quadratic function graphs look like? How do you find the x intercepts of a quadratic function? How do you determine the vertex and direction when given a quadratic function? How do you determine the range of a quadratic function? What is the domain of quadratic functions? How do you find the maximum or minimum of quadratic functions? How do you graph #y=x^2-2x+3#? How do you know if #y=16-4x^2# opens up or down? How do you find the x-coordinate of the vertex for the graph #4x^2+16x+12=0#? See all questions in Quadratic Functions and Their Graphs Impact of this question 3299 views around the world You can reuse this answer Creative Commons License