x³ + 0x² + 0x - y³ l x + y
-x³ - yx² x² - yx + y²
-yx² + 0x - y³
yx² + y²x
y²x - y³
-y²x - y³
por lo tanto x³ - y³ = (x + y)(x² - xy + y²)
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x³ + 0x² + 0x - y³ l x + y
-x³ - yx² x² - yx + y²
-yx² + 0x - y³
yx² + y²x
y²x - y³
-y²x - y³
por lo tanto x³ - y³ = (x + y)(x² - xy + y²)