Question

9x2 - 64 = 0, sendo U = R.​

Answer 1

Resposta:

$9x {}^{2} - 64 = 0$

$9x {}^{2} = 64$

$x {}^{2} = \frac{64}{9}$

$x = \pm \sqrt{ \frac{64}{9} }$

$x {}^{2} = \pm \frac{8}{3}$

$x 1= \frac{8}{3} \\ x2 = - \frac{8}{3}$

S {x1 = 8/3 , x2 = - 8/3}

Espero ter ajudado!!!