Resposta :

madelaideFestaLima
6.x2= 726
   x2= 726 : 6
   x2= 121
   x  = √121
   x  = 11
carloswms2012
[tex]6x^2=726\\x^2=\frac{726}{6}\\x^2=121\\x=\sqrt{121}\\\\x=\boxed{\boxed{11}}[/tex]

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