saylerbrookcrosby saylerbrookcrosby 10-12-2022 Mathematics Answered use a praphing calculator to approximate the vertex of the graph of the parabola defined by the following equation. y=-5x^2-4x+6 A. (2,6.8) B. (-0.4,6.8) C. (0.4, 6.8) D. (-0.4,5.2)