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Mathematics 16 Online
OpenStudy (anonymous):

can someone help me quickly? What is the equation of the following graph in vertex form? y = (x − 4)2 − 4 y = (x + 4)2 − 4 y = (x + 2)2 + 6 y = (x + 2)2 + 12

OpenStudy (anonymous):

Directrix (directrix):

Look at the graph. What are the coordinates of the vertex of the parabola?

OpenStudy (anonymous):

(4,-4) and (0,12)

Directrix (directrix):

(0,12) is the y intercept, not the vertex. The vertex is (4, -4)

Directrix (directrix):

The answer is one of these two: Which one? y = (x − 4)2 − 4 y = (x + 4)2 − 4

OpenStudy (anonymous):

2nd option

Directrix (directrix):

The x-coordinate of the vertex has to make (x +4) = 0. This one does not because (4 + 4) = 8. y = (x + 4)2 − 4

Directrix (directrix):

Try again.

OpenStudy (anonymous):

so its y=(x-4)^2-4

Directrix (directrix):

y = (x − 4)^2 − 4 Yes.

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