Greetings from Brasil...
Let us solve by parts. Power first
(X + 2)² = X² + 2.2.X + 2² = X² + 4X + 4
Rewriting
(X - 3).(X² + 4X + 4) applying distributive property
X³ + 4X² + 4X - 3X² - 12X - 12
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