SOLUTION: a parabola has its vertex at the origin, and the equation of its directrix is y=-10. Find the cordinates of the focus. A. (0,-10) B. (-10,0) C. (0,10) D. (10,0)

SOLUTION: a parabola has its vertex at the origin, and the equation of its directrix is y=-10. Find the cordinates of the focus. A. (0,-10) B. (-10,0) C. (0,10) D. (10,0)

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Question 965257: a parabola has its vertex at the origin, and the equation of its directrix is y=-10. Find the cordinates of the focus.
A. (0,-10)
B. (-10,0)
C. (0,10)
D. (10,0)
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!
vertex at the origin (,)=(,)
directrix: => since we have =>
and, since focus is at (,), we have (,)=> (,)
so, your answer is C. (,)
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