2100013436 2100013436 08-12-2022 Mathematics Answered Select all of the following that are quadratic equations. x2 + 3 x -5 = 0 x2 - x = 3 x + 7 5 x - 7 = 0 7 x2 + 14 x = 0 x3 - 3 x2 + 1 = 0 x - 5 = 9 x + 7