What is the vertex of #y=(x +3)^2 -6x #? Algebra Quadratic Equations and Functions Quadratic Functions and Their Graphs 1 Answer VinÃcius Ferraz Jul 1, 2017 #V = (0, 9)# Explanation: If #y = ax^2 + bx + c# then #V = (-b/(2a), - Delta/(4a)) # #y = x^2 + 6x + 9 - 6x# #a = 1, b = 0, c = 9# #Delta = 0^2 - 4 * 1 * 9 = -36# 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 1143 views around the world You can reuse this answer Creative Commons License