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X^2 + 5X - 300= 0
X .................... -15
X .......................20
X-15=0
X=15
J^2 + 5J = 300
J^2 + 5J -300 = 0
Ahora aplicaras la fomula general, nos daria :
-5+√25 -4(1)(300)
----------------------
2
-5+√1225
------------
2
-5+35
--------
2
15
Respuesta : la edad de Juan es 15 años ;)