a) 2xy - 6y² = 2y(x - 3y)
b) 9x - x³ = x(9 - x²) = x(3 + x)(3 - x)
c) -3a² - 6ab - 3b² = -3(a² + 2ab + b²) = -3(a + b)²
a) 2xy - 6y² = 2y(x - 3y)
b) 9x - x³ = x(9 - x²) = x(3 + x)(3 - x)
c) -3a² - 6ab - 3b² = -3(a² + 2ab + b²) = -3(a + b)²