Question

B)9x²-4=0
Equação de 2ºgrau

Answer 1

Resposta:

$x' = \frac{2}{3}\\x'' = (\frac{-2}{3})$

Explicação passo-a-passo:

$9x^{2} - 4 = 0$

$\triangle = 0^{2}-4.9.(-4)\\\triangle = 0 + 144\\\triangle = 144$

$x = \frac{-0 +-\sqrt{144}}{2.9}$

$x = \frac{-0 +-\sqrt{144}}{18}$

$x = \frac{-0+-12}{18}$

$x' = \frac{12}{18} = \frac{2}{3}$

$x'' = (\frac{-12}{18}) = (\frac{-2}{3})$