select all of the following equation(s) that are quadratic in form. x4 – 6x2 – 27 = 0 3x4 = 2x 2(x 5)4 2x2 5 = 0 6(2x 4)2 = (2x 4) 2 6x4 = -x2 5 8x4 2x2 – 4x = 0