El cuadrado de un numero disminuido en 9 equivale a 8 veces el exceso de el numero sobre 2 hallar el numero
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(x^2) - 9 = 8(x-2)
(x^2) = 8x - 16 +9
(x^2) - 8x = -7
factorizamos completando el trinomio
(x^2) - 8x +16 = 9
(x-4)^2 = 9
x-4 = 3
x= 7
el número es 7