lindseyhajdukovich lindseyhajdukovich 02-03-2017 Mathematics contestada Select all of the following that are quadratic equations. a. x^2 - 2x = 4x + 1 b. x^3 - 6x^2 + 8 = 0 c. 5x - 3 = 0 d. 2x^2+ 12x = 0 e. 5x - 1 = 3x + 8 f. 9x^2 + 6x - 3 = 0