document.write( "Question 1170411: Find the equation of the parabola with vertex at (2, -1) and directrix y+2=0. Sketch the graph. \n" ); document.write( "

Algebra.Com's Answer #795317 by josgarithmetic(39617) $\"\"$ $\"About$

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That is directrix y=-2, and vertex (2,-1). These are 1 unit apart at their nearest points. Focus must be 1 unit above the vertex so focus is at (2,0). Do a quick sketch of these focus, vertex, and directrix. These indicate that vertex is a minimum.\r
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\n" ); document.write( "\n" ); document.write( "You could form your equation based on $\"%28x-h%29%5E2=4p%28y-k%29\"$ .\r
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\n" ); document.write( "\n" ); document.write( " $\"4p=4%2A1=4\"$ ;\r
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\n" ); document.write( "\n" ); document.write( " $\"highlight%28%28x-2%29%5E2=4%28y%2B1%29%29\"$ \n" ); document.write( "

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