Focus and Directrix S25

If a parabola has a focus at (0,3) and a vertex at the origin...what is the equation of the directrix?

• y=3

• y=-3

• x=3

• x=-3

If a parabola has a focus at (3,0) and a vertex at the origin...what is the equation of the parabola?

• y²=12x

• y²=-12x

• x²=12y

• x²=-12y

If a parabola has a focus at (0,3) and a vertex at the origin...what is the equation of the parabola?

• y²=12x

• y²=-12x

• x²=12y

• x²=-12y

Write the equation of the parabola shown...

• y²=8x

• y²=-8x

• x²=8y

• x²=-8y

Write the equation of the parabola shown if focus is at green point...

• y²=16x

• y²=4x

• x²=16y

• x²=4y

If the directrix is y = 4 and the focus is at 
(3, 0), the value of p is:

• 8
• -8
• 2
• -2

What is the point inside the parabola 'p' units from the vertex?

• vertex
• focus
• directrix
• axis of symmetry

Find the vertex, focus, and directrix of the parabola: x² = 28y

• Vertex: (0, 0) Focus: (0,7) Directrix: y=-7
• Vertex: (0, 0) Focus: (7,0) Directrix: y=7
• Vertex: (0, 0) Focus: (0,-7) Directrix: x=-7
• Vertex: (0, 0) Focus: (7, 0) Directrix: x=7

The focus is at (2,0) and the vertex is at (-4,0).  What is the equation of the parabola?

• y² = 24(x+4)
• (y+4)² = -12x
• x² = 16(y+4)
• (x+4)²  = -20y

(y-4)² = -8(x+1)
What are the coordinates for the focus?

• (1,4)
• (-1,6)
• (-1,2)
• (-1,4)