c) 5i ou -5i
[tex]x^2+25=0[/tex]
[tex]x^2=-25[/tex]
[tex]x=\pm \sqrt{-25}[/tex]
[tex]x=\pm \sqrt{25}i[/tex]
[tex]x=\pm5i[/tex]
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c) 5i ou -5i
[tex]x^2+25=0[/tex]
[tex]x^2=-25[/tex]
[tex]x=\pm \sqrt{-25}[/tex]
[tex]x=\pm \sqrt{25}i[/tex]
[tex]x=\pm5i[/tex]