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Question Number 163865 by mathlove last updated on 11/Jan/22

Answered by TheSupreme last updated on 11/Jan/22

$$x\ne \pm 1$$$$$$

Commented by mr W last updated on 11/Jan/22

$$whynot\pm 1?$$

Answered by mahdipoor last updated on 11/Jan/22

$$if\frac{a}{b}>0\Rightarrow ab>0$$$$\Rightarrow \mid x-1\mid +\mid x+1\mid >2>0\Rightarrow \mathrm{\forall }x\in R$$

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