Resolución
[tex]x^{2} -9=0[/tex]
[tex]x^{2}=9[/tex]
[tex]x=\pm \sqrt{9}[/tex]
[tex]x=\pm 3[/tex]
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y t queda x2 = 9
después sacas raíz de 9 para quitar el cuadrado de x y queda 3
Resolución
[tex]x^{2} -9=0[/tex]
[tex]x^{2}=9[/tex]
[tex]x=\pm \sqrt{9}[/tex]
[tex]x=\pm 3[/tex]
RPTA = ±3