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.


Discussion

No Comment Found

Related InterviewSolutions