document.write( "Question 323141: Equation of the parabola whose vertex is(-2,0) and directrix x=1 is
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\n" ); document.write( "a)y²=-2(x+2)
\n" ); document.write( "b)y²=-4(x+3)
\n" ); document.write( "c)y²=-6(x-5)
\n" ); document.write( "d)y²=-12(x+2)
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Algebra.Com's Answer #231332 by galactus(183)\"\" \"About 
You can put this solution on YOUR website!
The parabola opens in the negative x direction. \r
\n" ); document.write( "\n" ); document.write( "It has an equation of the form \"%28y-h%29%5E2=-4p%28x-k%29\"\r
\n" ); document.write( "\n" ); document.write( "Where (h,k) are the coordinates of the vertex. p is the distance from the directrix to the vertex or from the focus to the vertex. In this case, p=3\r
\n" ); document.write( "\n" ); document.write( "\"y%5E2=-12%28x%2B2%29\"
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