SOLUTION: what is the focal point of x2=-10y

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Question 1185526: what is the focal point of x2=-10y
Answer by ikleyn(52860) About Me  (Show Source):
You can put this solution on YOUR website!
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If a parabola has equation  (is presented in the form)  y = %281%2F%284p%29%29%2Ax%5E2,

then the focal point is  F = (0,p).



In this problem,  y = %281%2F%28-10%29%29%2Ax%5E2,  so  4p = -10;  THEREFORE,  p = -10%2F4 = -2.5.


HENCE, the focal point is  F = (0,-2.5).

Solved, answered and explained.