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fondo =6+x
frente=x
Fórmula del area
A=base*altura
(6+x)*(x)=247
6x+x^2=247
ordenando
x^2+6x=247
factorizando
(x-13)(x+19)=0
x1=13
x2=-19
tomaremos el valor positivo ya que no existen medidas negativas.
fondo=6+x =》6+13=19
frente = 13