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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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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

User Tojo Chacko
by
3.1k points

1 Answer

18 votes
18 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.

What is the x-coordinate of the vertex of the parabola whose equation is y = 3x² + 9x-example-1
User Boredabdel
by
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