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What is the x-coordinate of the vertex of the parabola whose equation is y = 3x² + 9x?
o-3
o-1 1/12
o-2/3

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Respuesta :

Answer: x=-1,5.

Step-by-step explanation:

[tex]y=3x^2+9x\\\boxed {x=-\frac{b}{2a} }\\a=3,\ \ \ \ \ b=9.\\x=-\frac{9}{2*3}=-\frac{3}{2}=-1,5.[/tex]

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