What is the vertex form of #y= x^2 + 4x -21 #? Algebra Quadratic Equations and Functions Vertex Form of a Quadratic Equation 1 Answer Binayaka C. Mar 24, 2016 In vertex form ; # y= (x+2)^2-25# Explanation: #y=x^2+4x-21 or y = x^2+4x+4-25 or y= (x+2)^2 -25 # Here vertex is at (-2,-25) graph{x^2+4x-21 [-80, 80, -40, 40]}[Ans] 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 4701 views around the world You can reuse this answer Creative Commons License