1) b² - 16 = (b + 4)(b - 4)2) 25a² - 81y² = (5a + 9y)(5a - 9y)3) x² - 6x + 9 = (x - 3)(x - 3) = (x - 3)²4) 4y³ - y = y(4y² - 1) = y(2y - 1)(2y + 1)
1) b² - 16 = (b + 4)(b - 4)
2) 25a² - 81y² = (5a + 9y)(5a - 9y)
3) x² - 6x + 9 = (x - 3)(x - 3) = (x - 3)²
4) 4y³ - y = y(4y² - 1) = y(2y - 1)(2y + 1)