tolong yg baik pakai carany

Jawab :

(x + 2)(x² + 4x - 1)
= x(x² + 4x - 1) + 2(x² + 4x - 1)
= x³ + 4x² - x + 2x² + 8x - 2
= x³ + 6x² + 7x - 2