Graph the equation. Identify the focus and directrix of the parabola.
y2=−4x
Clear All Draw: 
Focus:
Directrix:
[more..]
Enter your answer as an n-tuple of numbers. Example: (2,5.5172)
Enter DNE for Does Not Exist
Enter your answer as an equation. Example: y=3x^2+1, 2+x+y=3
Be sure your variables match those in the question