How do you find the vertex of #f(x)= -x^2-3x-6#? Algebra Quadratic Equations and Functions Vertex Form of a Quadratic Equation 1 Answer Nghi N. Jun 9, 2015 Vertex of# f(x) = - x^2 - 3x - 6# Explanation: x of vertex: #x = (-b/(2a)) = 3/-2 = - 3/2# y of vertex: #y = f(-3/2) = - (9/4) + 9/2 - 6 = 9/4 - 6 = - 15/4# Answer link Related questions What is the Vertex Form of a Quadratic Equation? How do you find the vertex form of a quadratic equation? How do you graph quadratic equations written in vertex form? How do you write #y+1=-2x^2-x# in the vertex form? How do you write the quadratic equation given #a=-2# and the vertex #(-5, 0)#? What is the quadratic equation containing (5, 2) and vertex (1, –2)? How do you find the vertex, x-intercept, y-intercept, and graph the equation #y=-4x^2+20x-24#? How do you write #y=9x^2+3x-10# in vertex form? What is the vertex of #y=-1/2(x-4)^2-7#? What is the vertex form of #y=x^2-6x+6#? See all questions in Vertex Form of a Quadratic Equation Impact of this question 2003 views around the world You can reuse this answer Creative Commons License