x = 4
Объяснение:
(x + 2)³ -(x - 2)³ = 2x × (6x + 2)
x³ + 6x² + 12x + 8 - (x³ - 6x² + 12x - 8) = 12x² + 4x
x³ + 6x² + 12x + 8 - x³ + 6x² - 12x + 8 = 12x² + 4x
12x² + 16 = 12x² + 4x
16 = 4x
4x = 16
x = 4
Объяснение:
(x + 2)³ -(x - 2)³ = 2x × (6x + 2)
x³ + 6x² + 12x + 8 - (x³ - 6x² + 12x - 8) = 12x² + 4x
x³ + 6x² + 12x + 8 - x³ + 6x² - 12x + 8 = 12x² + 4x
12x² + 16 = 12x² + 4x
16 = 4x
4x = 16
x = 4