What is the x-coordinate of the vertex of the parabola whose equation is y=3x^2+9x -3 -2/3 -1 1/2

Intermediate Algebra
19th Edition
ISBN:9780998625720
Author:Lynn Marecek
Publisher:Lynn Marecek
Chapter11: Conics
Section11.2: Parabolas
Problem 98E: Explain in your own words, how you can tell from its equation whether a parabola opens up, down,...
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What is the x-coordinate of the vertex of the parabola whose equation is y=3x^2+9x

-3

-2/3

-1 1/2

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