What is the vertex of the parabola defined by the equation
(x − 2)2 = -12(y − 2)?

Question

What is the vertex of the parabola defined by the equation
(x − 2)2 = -12(y − 2)?

anonymous · Answer

do you have choices?

anonymous · Answer

(-12, 2)



(2, 2) 



(6, 2)



(2, -2

anonymous · Answer

its b because it shows me on the graph i made

anonymous · Answer

thanks can u help me with another

anonymous · Answer

sure

anonymous · Answer

A parabola is defined by the equation x = 5y2. In which direction will the parabola open?

cjga20049ers · Answer

To find the x-coordinate of the vertex, you use the formula -b/2a. (Remember that the standard form of a quadratic is y = ax2 + bx + c.) So in this case b = 8 and a = 2.

-b/2a = -8/(2·2) = -8/4 = -2

Now to find the y-coordinate, simply plug the x-value into the quadratic equation.

y = 2x2 + 8x + 9

y = 2(-2)2 + 8(-2) + 9

y = 8 - 16 + 9

y = 1

So the vertex is at the point (-2, 1)     choice D

8/11/2013 | CJ