Respuesta :

Medunno13

Answer: -3/2

Step-by-step explanation:

The axis of symmetry, and thus the x-coordinate of the vertex, is given by [tex]x=-\frac{b}{2a}[/tex]

So, the answer is [tex]x=-\frac{9}{2(3)}=\boxed{-\frac{3}{2}}[/tex]

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