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A = 3x - x² - 4
B = - x³ + 2x - 1
B = 2x - x³ - 1
Hallar: A - B
A - B
(3x - x² - 4) - (2x - x³ - 1)
3x - x² - 4 - 2x + x³ + 1
x - x² + x³ - 3
x³ - x² + x - 3