[tex]\displaystyle\bf\\x^{2} -9=0\\\\x^{2} =9\\\\x_{1,2} =\pm \ \sqrt{9} =\pm \ 3\\\\Otvet \ : \ 3 \ ; \ - 3[/tex]
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[tex]\displaystyle\bf\\x^{2} -9=0\\\\x^{2} =9\\\\x_{1,2} =\pm \ \sqrt{9} =\pm \ 3\\\\Otvet \ : \ 3 \ ; \ - 3[/tex]