Question

como resolve essa eguaçao do 2 grau 9x2-1=0

Answer 1

$9 x^{2}-1=0$ ⇔ $9 x^{2}=1$ ⇔ $x^{2}= \frac{1}{9}$ ⇔ $x= \sqrt{ \frac{1}{9}}$ ⇔ $x= \frac{\sqrt{1}}{\sqrt{9}}$ ⇔ $x=\frac{1}{3}$

Answer 2

9x^2 - 1 = 0 9x^2 = 1 x^2 = 1/9 x = +-√1/9 x = +-1/3 S = {1/3,-1/3}