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

asked Mar 6, 2023 147k views

3 votes

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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2 votes

Answer: x=-1,5.

Explanation:

$y=3x^2+9x\\\boxed {x=-(b)/(2a) }\\a=3,\ \ \ \ \ b=9.\\x=-(9)/(2*3)=-(3)/(2)=-1,5.$

Bzg answered Mar 12, 2023

by Bzg

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