document.write( "Question 200112: x^2+y^2+2x-4y-4=0 complete square and state the center and the radius or the circle \n" ); document.write( "

Algebra.Com's Answer #150434 by orca(409) $\"\"$ $\"About$

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First moving the constant term to the right side, we have
\n" ); document.write( " $\"x%5E2%2By%5E2%2B2x-4y=4\"$
\n" ); document.write( "Re-arranging the terms on the left side, we get
\n" ); document.write( " $\"x%5E2%2B2x%2By%5E2-4y=4\"$
\n" ); document.write( "Add 1 and 4 to both sides, we have
\n" ); document.write( " $\"x%5E2%2B2x%2B1%2By%5E2-4y%2B4=4%2B1%2B4\"$
\n" ); document.write( " $\"%28x%2B1%29%5E2%2B%28y-2%29%5E2=9\"$
\n" ); document.write( " $\"%28x%2B1%29%5E2%2B%28y-2%29%5E2=3%5E2\"$ \r
\n" ); document.write( "\n" ); document.write( "So the center of the circle is (-1, 2). The radius is 3.\r
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