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número cuyo quíntuplo 5x
aumentado en 6 + 6
es igual a su cuadrado = x²
x² = 5x + 6
x² - 5x - 6 = 0
aplicamos la fórmula general
a = 1 b = - 5 c = - 6
El conjunto solución será (6, -1) Tomaremos el valor positivo = 6