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Lim x³ + 729 Lim x³ + 9³
x-> - 9 ------------- = x-> - 9 --------- = Factorizas caso suma de cubos
x + 9 x + 9
Lim (x + 9)(x² - 9x + 81)
x-> -9 --------------------------- = Simplificas (x + 9)
(x + 9)
Lim x² - 9x + 81 = (- 9)² - 9( - 9) + 81 = 81 + 81 + 81 = 243
x-> -9
Respuesta.
243