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Tenemos.
El numero = x
El reciproco = 1/x
x/(1/x) = 81
x * x/1 = 81
x² = 81 Tiene 2 soluciones reales
x = +/-√81
x = √81 =
x = √9²
x = 9 Porque 9 * 9 = 81
o
x = - √81
x = - 9 Porque ( -9)( - 9) = 81
Solucion.
(9 , - 9)