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show-that-if-x-R-then-x-and-x-cannot-be-positive-




Question Number 123638 by 676597498 last updated on 26/Nov/20
show that if x∈R then x and −x cannot be positive
$$\mathrm{show}\:\mathrm{that}\:\mathrm{if}\:\mathrm{x}\in\mathbb{R}\:\mathrm{then}\:\mathrm{x}\:\mathrm{and}\:−\mathrm{x}\:\mathrm{cannot}\:\mathrm{be}\:\mathrm{positive} \\ $$
Commented by talminator2856791 last updated on 27/Nov/20
 this is just a rule
$$\:\mathrm{this}\:\mathrm{is}\:\mathrm{just}\:\mathrm{a}\:\mathrm{rule} \\ $$

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