## Question

###### Show, as in Examples 1.1.2 and 1.1.3, that $A=B$. $A=\left\{x \mid x^{2}-4 x+4=1\right\}, B=\{1,3\}$

Show, as in Examples 1.1.2 and 1.1.3, that $A=B$. $A=\left\{x \mid x^{2}-4 x+4=1\right\}, B=\{1,3\}$

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