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x^2+y^2 = 74
y = 12-x
x^2+(12-x)^2 = 74
x^2 + 144 - 24x + x^2 = 74
2x^2 - 24x + 144 = 74
2x^2 - 24x + 70 = 0
Aplico resolvente x = [(-b±√(b²-4ac)]/(2a)
Raíces de la ecuación 5 y 7
Comprobación
5+7 = 12 <--------------
25+49 = 74 <-------------