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find the length of the laus rectum of the parabola-


4y^2+2x-20y+17=0


plz help..thanx in advance!!

3 years ago

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Answers : (2)

                                        

the above equation can be written as 


                                                   ( 2y-5)^2=2(x+4)


                                                   therefore the length of the latus rectum is 2

3 years ago
                                        

A small mistake in the above post.


 


(2y-5)2 = -2x-17+25 = -2x+8 = -2(x-4)


 


or, (y- 5/2)2 = -1/2 * (x-4)


 


So Latus Rectum is 1/2 .

3 years ago

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