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Su cuadrado es x²
El doble de 5 es 10, el anterior a 10 es 9
Planteo la ecuación:
x²-16 = 9
x² = 9+16
x² = 25
x = √25
x = +-5
Comprobamos:
5²-16 = 25-16 = 9
(-5)²-16 = 25-16 = 9