(p + 8)² = p² + 16p + 64
(10x - 3y)² = 100x² - 60xy + 9y²
(x - 9)(x + 9) = x² - 9² = x² - 81
(4m + 7n)(7n - 4m) = (7n)² - (4m)² = 49n² - 16m²
16 - c² = 4² - c² = ( 4 - c)(4 + c)
p² + 2p + 1 = ( p + 1)² = (p + 1)(p + 1)
9m² - 25 = (3m)² - 5² = (3m - 5)(3m + 5)
36m² + 24mn + 4n² = (6m + 2n)² = (6m + 2n)(6m + 2n)
(a - 10)² - (a - 5)(a + 5) = a² - 20a + 100 - a² + 25 = 125 - 20a