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18-07-2017
Mathematics

contestada

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

A. -3
B. -1 and a half
C. -2/3

Respuesta :

18-07-2017

Find the vertex by setting the 1st derivative to 0
1st derivative is y=6x+9.

6x+9=0 => x=-9/6 = -3/2

So B is the answer.

Answer Link

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