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X³ - 5X² + 3X - 4 + (3X³ - 7X - 6) = 4X³ - 5X² - 4X - 10
A - B:
X³ - 5X² + 3X - 4 - (3X³ - 7X - 6) = X³ - 5X² + 3X - 4 - 3X³ + 7X + 6
= -2X³ - 5X² + 10X + 2
D²
(X - 3)² = X² - 2(X)(3) + (-3)² = X² - 6X + 9