[tex]-a^2+9=0\\9=a^2\\x_{1} =3.\\x_{2} =-3.[/tex]
Ответ:
-а²+9=0
-а²=-9
а²=9
а=±3
а=-3 а=3
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[tex]-a^2+9=0\\9=a^2\\x_{1} =3.\\x_{2} =-3.[/tex]
Ответ:
-а²+9=0
-а²=-9
а²=9
а=±3
а=-3 а=3