$f) (x+1)² = 1$
$⇔ (x +1)² -1 = 0$
$⇔ (x +1 -1).(x +1 +1) = 0$
$⇔ (x +0).(x +2) = 0$
$⇔ \left[ \begin{array}{l}x +0=0\\x +2=0\end{array} \right. ⇔ \left[ \begin{array}{l}x=0\\x=-2\end{array} \right.$
$Vậy$ $S =$ {$0; -2$}
$g) (x-2)² = 2$
$⇔ (x -2)² -2 = 0$
$⇔ (x -2 -√2).(x -2 +√2) = 0$
$⇔ \left[ \begin{array}{l}x -2 -√2 = 0\\x -2 +√2= 0\end{array} \right. ⇔ \left[ \begin{array}{l}x=2 +√2\\x=2 -√2\end{array} \right.$
$Vậy$ $S =$ {$2 +√2; 2 -√2$}
$h) (x+ √3)² = 5$
$⇔ (x +√3)² -5 = 0$
$⇔ (x +√3 -√5).(x +√3 +√5) = 0$
$⇔ \left[ \begin{array}{l}x +√3 -√5=0\\x +√3 +√5=0\end{array} \right. ⇔ \left[ \begin{array}{l}x=√5 -√3\\x=-√5 -√3\end{array} \right.$
$Vậy$ $S =$ {$√5 -√3; -√5 -√3$}
Chúc bạn học tốt !!!
