Resposta :
[tex]x+x^2=6 \\
\\
x^2+x-6=0 \\
\\
\Delta=1^2-4.1.(-6)=1+24=25 \\
\\
x=\frac{-1+-\sqrt{25}}{2}=\frac{-1+-5}{2} \\
\\
x_1=-3 \\
\\
x_2=2[/tex]
[tex]x+x^2=6\\x+x^2-6=0\\\Delta=1^2-4.1.(-6)\\\Delta=25[/tex]
[tex]x= \frac{-1\pm5}{2} \left \{ {{x'=-3} \atop {x''=2}} \right. [/tex]
[tex]x= \frac{-1\pm5}{2} \left \{ {{x'=-3} \atop {x''=2}} \right. [/tex]