Resposta :

marcosamaral13
∆= b2- 4.a.c                                           
 ∆= 02- 4.2.(-98)                                  
 ∆=√ 784
∆=28
x’= 0+28/2.2= 28/4= 7     
  x”=0-28/4= -7     S={7,-7}
MaHePire

Resposta:

[tex]V=\{-7,+7\}[/tex]

Explicação:

[tex]2x^{2} -98=0\\2x^{2} =0+98\\2x^{2} =98\\x^{2} =\frac{98}{2}\\x^{2} =49\\x=\pm\sqrt{49}\\x=\pm\:7\\\\Logo\:V=\{-7,+7\}[/tex]

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