Question

What is the equation of the parabola, in vertex form, with vertex at (2,-4) and directrix y = -6?

a. (y+4)^2=8(x-2)

b. (y+6)^2=-8(x+2)

c. (x+2)^2=8(y+4)

d. (x-2)^2=8(y+4)

Answer 1

must be d

Answer 2

since the vertex is y = -6 the parabola is in the form (y -k)^2 = 4a(x -h)

the distance from the directrix to the vertex is 2 so a = 2... the parabola is concave right...

(y + 4)^2 = 8(x - 2)

Answer 3

is it A or D ?

Answer 4

its A

Answer 5

its D :/