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x=9
El numero = x
El cuadrado del numero = x²
x² - 8 = 73
x² = 73 + 8
x² = 81
x = √81 Tiene 2 soluciones
x = 9 Porque 9*9 = 81
o
x = - √81
x = - 9 Porque ( - 9)( - 9) = 81
Respuesta.
(9 , - 9)