document.write( "Question 1056075: write an equation of the parabola with the given characteristic.
\n" ); document.write( "focus (0,-1) directrix: y = 1 \n" ); document.write( "

Algebra.Com's Answer #671333 by ewatrrr(24785) $\"\"$ $\"About$

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\n" ); document.write( "the vertex form of a Parabola opening up(a>0) or down(a<0),
\n" ); document.write( " $\"y=a%28x-h%29%5E2+%2Bk\"$
\n" ); document.write( "where(h,k) is the vertex and x = h is the Line of Symmetry ,
\n" ); document.write( "the focus is (h,k + p), With Directrix y = (k - p), a = 1/(4p)
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\n" ); document.write( "focus (0,-1) directrix: y = 1
\n" ); document.write( "the focus is (h,k + p)
\n" ); document.write( "k + p = -1 focus y = -1
\n" ); document.write( "k - p = 1 directrix: y = 1
\n" ); document.write( "k = 0, p = -1, a = -1/4
\n" ); document.write( "V(0,0)
\n" ); document.write( "|\r
\n" ); document.write( "\n" ); document.write( " $\"y=%28-1%2F4%29%28x-0%29%5E2++%2B+0\"$
\n" ); document.write( " $\"y=%28-1%2F4%29%28x%29%5E2+\"$ \r
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