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n² - 5 = - 4
n² = - 4 + 5
n² = 1
n = +/-√1 Tiene como solución dos raices reales
n = √1
n = 1 Porque 1 * 1 = 1
0
n = - √1
n = - 1 Porque (- 1)(- 1) = 1
Solución.
(1 , - 1)
x -1 = 0 x +1 = 0
x = 1 x = -1
CS= (-1; 1)