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