Question Number 67574 by pete last updated on 28/Aug/19
$$\mathrm{Solve}\:\mathrm{x}^{\mathrm{2}} +\mathrm{1}<−\mathrm{5} \\ $$
Commented bymathmax by abdo last updated on 28/Aug/19
$$\left({e}\right)\Rightarrow{x}^{\mathrm{2}} +\mathrm{6}<\mathrm{0}\:\:\:{impossible}\:{equation}\:\Rightarrow{no}\:{solution}\: \\ $$ $${we}\:{can}\:{t}\:{talk}\:{about}\:{C}\:{set}\:{because}\:{no}\:{law}\:{ordre}\:{in}\:{C} \\ $$