Math Focus and Directrix Quiz

Question 1

y = x^2

Answer 1

Faces up.
Focus: (x, y + p)
Directrix: y = y - p

Question 2

y = -x^2

Answer 2

Faces down.
Focus: (x, y - p)
Directrix: y = y + p

Question 3

x = y^2

Answer 3

Faces right.
Focus: (x + p, y)
Directrix: x = x - p

Question 4

x = -y^2

Answer 4

Faces left.
Focus: (x - p, y)
Directrix: x = x + p