Question

3(3x ao quadrado - 4/3 ) = 0

Answer 1

$3( 3x^{2} - \frac{4}{3}) = 0$
$9x^{2} - \frac{12}{3} = 0$
$9x^{2} - 4 = 0$
$9x^{2} = 4$
$x^{2} = \frac{4}{9}$
$x = \sqrt{ \frac{4}{9} }$
$x = \frac{2}{3}$

Answer 2

3(3x² - 4) = 0
           3

9x² - 12 = 0
        3

9x² - 4 = 0
9x² = 4
x² = 4
      9
        ____
x = √4/9

x = 2 e x = - 2
      3           3