a) x³ + 4x² - x - 4; 6) a³-3ab - 2a²b + 66².

4. Представьте в виде произведения:

a) x³ + 4x² – x – 4 = (x³ + 4x²) – (x + 4) = x²(x + 4) – (x + 4) = (x + 4)(x² – 1) = (x + 4)(x – 1)(x + 1)

б) a³ – 3ab – 2a²b + 6b² = (a³ – 2a²b) – (3ab – 6b²) = a²(a – 2b) – 3b(a – 2b) = (a – 2b)(a² – 3b)

Ответ: a) (x + 4)(x – 1)(x + 1); б) (a – 2b)(a² – 3b)