Express (x - 1) (x + 2) (2x + 2) in standard form

2x³ + 4x² - 2x - 4

Step-by-step explanation:

Expand the first pair of factors then multiply by (2x + 2)

= (x² + x - 2) (2x + 2) → distribute terms

= x² (2x + 2) + x (2x + 2) - 2 (2x + 2)

= 2x³ + 2x² + 2x² + 2x - 4x - 4 (collect like terms)

= 2x³ + 4x² - 2x - 4 ← in standard form