Răspuns:
1.
[tex]2{x}^{2} - 6 = 0 \\ \\ 2 {x}^{2} = 6 \\ \\ {x}^{2} = 3 \\ \\ x1= \sqrt{3} \\ \\ x2 = - \sqrt{3} [/tex]
2.
[tex] - {x}^{2} + 5 = 0 \\ \\ - {x}^{2} = - 5 \\ \\ {x}^{2} = 5 \\ \\ x1 = \sqrt{5} \\ \\ x2 = - \sqrt{5} [/tex]
3.
[tex] {x}^{2} + 4 = 0 \\ \\ {x}^{2} = - 4 \\ {x}^{2} \geqslant 0 \: = > contradictie \\ \\ nu \: \: \: sunt \: \: solutii[/tex]
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