Question

9x²-1=0 ? Qual resultado e o cálculo ?

Answer 1

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

Answer 2

9x² - 1 = 0
9x² = 1
x² = 1/9
x = √1/9
x = + 1/3
x = - 1/3