B Belanova New member Joined Dec 9, 2007 Messages 3 Dec 9, 2007 #1 Write an equation of the axis of symmetry: y= 4x² -4 Find the coordinates of the vertex: y= 3x² y= 5x² -1 y= -2x² +4x -1
Write an equation of the axis of symmetry: y= 4x² -4 Find the coordinates of the vertex: y= 3x² y= 5x² -1 y= -2x² +4x -1
W wjm11 Senior Member Joined Nov 13, 2004 Messages 1,417 Dec 9, 2007 #2 Re: Quadratic Functions Write an equation of the axis of symmetry: y= 4x² -4 Click to expand... For a quadratic of the form 0 = ax^2 + bx + c, the x value of the vertex is given by: x = -b/2a (After finding the x value, plug that value into the original equation to find the y value, if the vertex point is desired.) In this case, a = 4, b = 0, and c = -4. Note: the vertex is always on the axis of symmetry, so x = -b/2a is also the equation for the axis of symmetry.
Re: Quadratic Functions Write an equation of the axis of symmetry: y= 4x² -4 Click to expand... For a quadratic of the form 0 = ax^2 + bx + c, the x value of the vertex is given by: x = -b/2a (After finding the x value, plug that value into the original equation to find the y value, if the vertex point is desired.) In this case, a = 4, b = 0, and c = -4. Note: the vertex is always on the axis of symmetry, so x = -b/2a is also the equation for the axis of symmetry.
