How do I use the vertex formula to determine the vertex of the graph for #y=2x^2 + 8x + 5#? Algebra Quadratic Equations and Functions Vertex Form of a Quadratic Equation 1 Answer Nghi N. May 1, 2015 Coordinates x and y of vertex #x = -b/(2a) = -8/4 = -2# #y = f[-b/(2a)] = f(-2) = 2.(-2)^2 + 8.(-2) + 5 = = 8 - 16 + 5 = -3# 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 1249 views around the world You can reuse this answer Creative Commons License