document.write( "Question 419366: Write an equation of a parabola with a vertex at the origin and a directrix at y = 5 \n" ); document.write( "
Algebra.Com's Answer #293295 by ewatrrr(24785)\"\" \"About 
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\n" ); document.write( "Hi
\n" ); document.write( "parabola with a vertex at the origin and a directrix at y = 5
\n" ); document.write( "The standard form is \"%28x+-h%29%5E2+=+4p%28y+-k%29\", where the focus is (h,k + p)
\n" ); document.write( "p = -5
\n" ); document.write( " parabola opening downward y = -20x^2
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