document.write( "Question 1100547: Can I have some help with this one too please? What is the equation of the parabola, with vertex at (2,-4) and directrix y=-6\r
\n" );
document.write( "\n" );
document.write( "A.(x+2)^2=8(y+4)
\n" );
document.write( "B.(y+4)^2=8(x-2)
\n" );
document.write( "C.(y+6)^2=-8(x+2)
\n" );
document.write( "D.(x-2)^2=8(y+4) \n" );
document.write( "
Algebra.Com's Answer #715090 by josgarithmetic(39626) ![]() You can put this solution on YOUR website! Vertex given means you want a factor of x-2 and y+4. Only choice D has these.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Otherwise you can find the focus and use definition of parabola and given directrix and found focus and derive the equation using definition of parabola and distance formula. \n" ); document.write( " |