Parametrics (1 Viewer)

[nrlwinner]

How can I solve that to get to

 

[shaon0]

How can I solve that to get to

x=(t-(4/t))
x^2=(t-(4/t))^2
x^2=(t^2+(16/t^2))-8
x^2+8=t^2+16/t^2
(x^2+8)/2=(t^2)/2+8/t^2
(x^2+8)/2=y
x^2+8=2y
x^2=2(y-4)

 

[nrlwinner]

Got another Q here.

and are two points on the parabola . The chord PQ subtends a right angle at the origin. If R is the fourth vertex of the rectangle POQR show that

R parametrically is when st=-4

 

[nrlwinner]

Anyone?

 

[elv09]

http://www.easy-share.com/1909317349/IMG_0006.jpg

i could be wrong for the x-coordinate ...