Question

(3x-1)²=1 qual a resolução?

Answer 1

(3x-1)² = 1 
(3x - 1) × (3x - 1) = 1
(3x)² + (3x×(-1)) + ((-1)×3x) + (-1)² = 1
9x² + (-3x) + (-3x) + 1 = 1
9x² - 3x - 3x + 1 - 1 = 0
9x² - 6x = 0
x(9x - 6) = 0

x = 0

9x - 6 = 0
9x = 6
x = $\frac{6}{9} = \frac{2}{3}$