(2x + 1)(2x + 3)(2x + 5)(2x + 15) = x2

1) (2x + 1)(2x + 3)(2x + 5)(2x + 15) = x2
2) 4(x + 5) (x + 6)(x + 10)(x + 12) = 3x2
3) (x + 2)(x+4)2(x+4)2(x + 8) = x2
...
4) (4x2x2 - 4x + 1)(x2x2 - 4x + 4) = x2