document.write( "Question 1085007: Arrange the problem is represented by the equations in increasing order with respect to the Y values of the directrixes.
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Algebra.Com's Answer #699052 by AnlytcPhil(1807) $\"\"$ $\"About$

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document.write( "Complete the square on the left:\r\n" );
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document.write( "Compare to\r\n" );
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document.write( "The equation of the directrix is \r\n" );
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document.write( " <-- equation of directrix\r\n" );
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document.write( "----------------------\r\n" );
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document.write( "y=-x^2+3x+8, substitute in above, a=1, b=3, c=8, directrix: y = 6 \r\n" );
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document.write( "y=2x^2+15x+18, substitute a=2, b=15, c=18, directrix: y = -10 \r\n" );
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document.write( "y=x^2+13x+5, substitute a=2, b=13, c=5, directrix: y = -37 \r\n" );
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document.write( "y=-2x^2+4x+8, substitute a=-2, b=4, c=8, directrix: y = 9.975\r\n" );
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document.write( "Edwin

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