E(x) = (2x-1)^2 + (x+3)^2 - (x+6)(x-6) - (x-2)(x+3) - x(3x+1) =
= 4x^2 - 4x + 1 + x^2 + 6x + 9 - (x^2 - 36) - (x^2 + 3x - 2x - 6) - (3x^2 + x) =
= 4x^2 - 4x + 1 + x^2 + 6x + 9 - x^2 + 36 - x^2 - 3x + 2x + 6 - 3x^2 - x =
= 52
E(2009) = 52
x^4 - 81 = (x^2 - 9)(x^2+9) = (x-3)(x+3)(x^2+9)