Answer :
(x + 6)² (x - 3)²
(x + 6)(x + 6) (x - 3)(x - 3)
x² + 6x + 6x + 36 x² - 3x - 3x + 9
x² + 12x + 36 x² - 6x + 9
(x + 6)(x + 6) (x - 3)(x - 3)
x² + 6x + 6x + 36 x² - 3x - 3x + 9
x² + 12x + 36 x² - 6x + 9