What are the coordinates of the vertex of the graph of the function y = –3x² –12x + 3?
a. (–2, 29)
b. (2, –15)
c. (2, –9)
d. (–2, 15)

Question

What are the coordinates of the vertex of the graph of the function y = –3x² –12x + 3?
a. (–2, 29)
b. (2, –15)
c. (2, –9)
d. (–2, 15)

directrix · Answer

The x-coordinate of the vertex is x = -b/(2a) where b is the coefficient of x and a is the coefficient of x^2 in the equation y = –3x² –12x + 3.

directrix · Answer

b = -12 and a = -3.

x coordinate of vertex is -(-12)/(2(-3). What does that equal? @ballerina789

anonymous · Answer

-18

directrix · Answer

I got x = -2. Check my work, please. (if you can read my sloppy writing :)

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