Respuesta :

The equation of symmetry of a quadratic equation is given as;

[tex]x=\frac{-b}{2a}[/tex][tex]\begin{gathered} x=\frac{-(-36)}{2(-3)}=\frac{36}{-6}=-6 \\ x=-6 \end{gathered}[/tex]

The answer is;

x=-6

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