1)(х+1)³-(х-1)³=х(6х+2) 2)(x-2)³-3x²-4=(x-3)³ 3)(x+2)³-(x-1)³=9x²+36 4)(x+3)³=x²(x+9)

 №1  x ^3 - 3x^2 + 3x - 1 - (x^3 -3x^2 + 3x - 1) = 6x^2 + 2x    6x^2 + 2x = 0    2x (3x + 1) = 0     2x = 0        x1 = 0   3x + 1 = 0   3x = - 1    x2 = - 1/3 --------------------------------------------------------------------------------- №3 x^3 + 3x^2*2 + 3x*4 + 8 - ( x^3 - 3x^2 + 3x -1) = 9x^2 + 36 x*3 + 6x^2 + 12x + 8 - x^3 + 3x^2 - 3x + 1) = 9x^2 + 36 x^3 + 6x^2 - 9x^2 + 12x + 8 - 36 -x^3 + 3x^2 - 3x + 1 = 0  12x - 3x -28 + 1 = 0  9x = 28 - 1  9x = 27   x = 3 ----------------------------------------------------------------------------------- №4 x^3 + 9x^2 + 27x + 27 - x^3 - 9x^2 = 0 27x = - 27     x = - 1 ------------------------------------------------------------------------------------ №2 х^3 - 6x^2 +12x - 8 -3x^2 -4 = x^3 - 9x^2 + 27x - 27 x^3 - 6x^2 + 12x - 8 - 3x^2 -4 - x^3 + 9x^2 - 27x + 27 = 0 12x - 12 - 27x + 27 = 0 - 15x = -27 + 12 - 15x = - 15        x = 1