genesisostos genesisostos
  • 17-02-2022
  • Mathematics
contestada

Despejar la variable
2x al cuadrado + 15= 113

Respuesta :

lvvies
lvvies lvvies
  • 17-02-2022

Hola!

x = 7 , x = -7

Explicación:

Comienza restando 15 en cada lado:

[tex]2x^{2} + 15 -15=113-15[/tex]

Usted obtiene:

[tex]2x^{2} =98[/tex]

Ahora divide ambos lados por 2:

[tex]\frac{2x^{2} }{2} =\frac{98}{2}[/tex]

Usted obtiene:

[tex]x^{2} =49[/tex]

Como la ecuación está al cuadrado, tendrás que hacer:

[tex]x=\sqrt{f(a)} , x=-\sqrt{f(a)}[/tex]

que te da: [tex]x=\sqrt{49} , x =-\sqrt{49}[/tex]

Entonces:

[tex]\sqrt{49}=7 , -\sqrt{49} = -7[/tex]

Answer Link

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