Respuesta :

gmany
[tex]f(x)=x^2-2x;\ g(x)=6x+4\\\\(f+g)(x)=(x^2-2x)+(6x+4)=x^2+4x+4[/tex]

[tex](f+g)(x)=0\iff x^2+4x+4=0\\\\x^2+2x+2x+4=0\\\\x(x+2)+2(x+2)=0\\\\(x+2)(x+2)=0\\\\(x+2)^2=0\iff x+2=0\ \ \ |-2\\\\\boxed{x=-2}[/tex]

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