9 (- 9x 2 6x 3 July 8, 2019 16 32 64 128 10 4x 3 9x 2 6x 9 7x 6 Vertex of parabola 9x 2 6x 36y 9 0 9x 3 6x 2 28x 9 )/( 3x 1 2x 9