document.write( "Question 141249: What are the coordinates of the centre of x^2+y^2-4x+2y-4=0??? \n" ); document.write( "
Algebra.Com's Answer #102918 by scott8148(6628)\"\" \"About 
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x^2-4x+y^2+2y=4 __ x^2-4x+4+y^2+2y+1=4+4+1 __ (x-2)^2+(y+1)^2=3^2\r
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\n" ); document.write( "\n" ); document.write( "cent(er) at (2,-1) with a radius of 3
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