Respostas

  • Usuário do Brainly
2013-05-31T11:58:54-03:00

Temos que:

 

9\text{x}^2-49=0

 

Isolando o \text{x}^2:

 

\text{x}^2=\dfrac{49}{9}

 

\text{x}=\pm\sqrt{\dfrac{49}{9}}=\pm\dfrac{7}{3}

 

Logo, \text{S}=\{\pm\frac{7}{3}\}

2013-05-31T12:15:10-03:00

olá!!!

 

Basta vc isolár o X²

 

<span>9x^2-49=0


9x^2=49

x^2=<span>\frac{49}{9}</span> 


x=\</span>±\sqrt{\frac{49}{9}}

 

x=\±\frac{7}{3}</p>&#10;<p> </p>&#10;<p>[tex]\Large{\boxed{x=\{-\frac{7}{3},\frac{7}{3}\}}}

    espero ter ajudado