Verified answer

[tex]f(x) = -x^{2} - x + 6[/tex]

[tex]\Delta=(-1)^{2}-4.(-1).6 =1+24=25[/tex]

[tex]x=\frac{-(-1)\pm\sqrt{25} }{2.(-1)}[/tex]

[tex]x_{1} =\frac{1+5}{-2}=-3[/tex]

[tex]x_{2}=\frac{1-5}{-2}=2[/tex]

Os zeros são -3 e 2.