Question

cat este x?
${(3x + 2)}^{2} = 1$
???????​

Answer 1

$\it (3x+2)^2=1 \Rightarrow \sqrt{(3x+2)^2}=\sqrt1 \Rightarrow |3x+2|=1 \Rightarrow 3x+2=\pm1 \Rightarrow \\ \\ \Rightarrow 3x+2\in\{-1,\ \ 1\}\Big|_{-2} \Rightarrow 3x\in\{-3,\ \ -1\}|_{:3} \Rightarrow x\in\{-1,\ \ -\dfrac{1}{3}\}$