9x 2 4x 1 0 July 8, 2019 16 32 64 128 4x 3 9x 2 6x 1 0 1 9x 0 2x 2 4x =- 1 12 4x 2 9x 1 0 quadratic formula 2x 9 9x 2 − 4 = 0