(x + 5)(x - 5)(x² + 5x + 25)(x² - 5x + 25) = x⁶ - 5⁶
(x + 5)(x - 5)(x² + 5x + 25)(x² - 5x + 25) = (x³ - 5³)(x³ + 5³)
(x + 5)(x² - 5x + 25)(x - 5)(x² + 5x + 25) = (x³ - 5³)(x³ + 5³)
(x³ + 5³)(x³ - 5³) = (x³ - 5³)(x³ + 5³)
(x + 5)(x - 5)(x² + 5x + 25)(x² - 5x + 25) = x⁶ - 5⁶
(x + 5)(x - 5)(x² + 5x + 25)(x² - 5x + 25) = (x³ - 5³)(x³ + 5³)
(x + 5)(x² - 5x + 25)(x - 5)(x² + 5x + 25) = (x³ - 5³)(x³ + 5³)
(x³ + 5³)(x³ - 5³) = (x³ - 5³)(x³ + 5³)