(2x - 3)^2 = 9(2x + 3)^2 (2x - 3)^2 = [3(2x + 3)]^2,两边开方 2x - 3 = 3(2x + 3) 或 - (2x - 3) = 3(2x + 3) 2x - 3 = 6x + 9 或 - 2x + 3 = 6x + 9 - 12 = 4x 或 - 6 = 8x x = - 3 或 x = - 3/4
