(x + 2)² - (x + 2) × (x - 1)
(x + 2) × (x + 2 - (x - 1))
(x + 2) × (x + 2 - x + 1)
(x + 2) × 3
3(x + 2)
(x + 2)² - (x + 2) × (x - 1)
(x + 2) × (x + 2 - (x - 1))
(x + 2) × (x + 2 - x + 1)
(x + 2) × 3
3(x + 2)