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25-04-2017
Mathematics

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x^2+2x=35

completing the square

Respuesta :

28-04-2017

[tex]x^2+2x=35[/tex]
[tex]x^2+2x+1=35+1[/tex]
[tex](x+1)^2=36[/tex]
[tex](x+1)^2=6^2[/tex]
[tex]x+1=6\lor x+1=-6[/tex]
[tex]x=6-1\lor x=-6-1[/tex]
[tex]\boxed{x=5\lor x=-7}[/tex]

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