document.write( "Question 358660: find the center (h,k) and radius r of the circle x^2+y^-4x+2y=20 by completing the circle \n" ); document.write( "

Algebra.Com's Answer #256135 by Fombitz(32388) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"+x%5E2%2By%5E2-4x%2B2y=20+\"$
\n" ); document.write( " $\"%28x%5E2-4x%29%2B%28y%5E2%2B2y%29=20\"$
\n" ); document.write( " $\"+%28x%5E2-4x%2B4%29%2B%28y%5E2%2B2y%2B1%29=20%2B4%2B1\"$
\n" ); document.write( " $\"%28x-2%29%5E2%2B%28y%2B1%29%5E2=25\"$
\n" ); document.write( " $\"%28x-2%29%5E2%2B%28y%2B1%29%5E2=5%5E2\"$
\n" ); document.write( ".
\n" ); document.write( "Compare to $\"%28x-h%29%5E2%2B%28y-k%29%5E2=r%5E2\"$
\n" ); document.write( ".
\n" ); document.write( ".
\n" ); document.write( "( $\"h\"$ , $\"k\"$ )=( $\"2\"$ , $\"-1\"$ )
\n" ); document.write( " $\"r=5\"$ \n" ); document.write( "

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