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El numero = x
El cuadrado del número = x²
x² + x = 306
x² + x - 306 = 0 Factorizas trinomio de la forma x² + bx + c
(x + 18)(x - 17) = 0 Tiene como solución 2 raices reales
x + 18 = 0
x = - 18
o
x - 17 = 0
x = 17
Solución.
(- 18 , 17)
x(x + 1) = 306
x(x + 1) = 17(18)
x = 17