InterviewSolution
Saved Bookmarks
| 1. |
Find the equation of the parabola whose is (2,-3) and directrix is x+4=0. |
|
Answer» Let focus is S(2,-3) and P(x,y) be any point on the parabola `:.` PS=PM where PM=Length of perpendicular from P to directrix. `rArr" "sqrt((x-2)^(2)+(y-3)^(2))=x+4` `rArr" "(x-2)^(2)+(y-3)^(2)=(x+4)^(2)` `rArr" " x^(2)-4x+4+y^(2)+6y+9=x^(2)+8x+16` `rArr" "y^(2)+6y-12x=3` Which is the required equation of the parabola. |
|