Mathematics
AlexanderPhanor
2016-04-18 19:58:21
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
ANSWERS
MelodyMortell265
2016-04-18 22:25:06

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.

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