Question

ajude por favor 9x²-49=0

Answer 1

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

Answer 2

olá!!!

 

Basta vc isolár o X²

 

$<span>9x^2-49=0$

$9x^2=49$

$x^2=<span>\frac{49}{9}</span>$ 

$x=\</span>±\sqrt{\frac{49}{9}}$

 

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

    espero ter ajudado