document.write( "Question 813721: Hi,\r
\n" ); document.write( "\n" ); document.write( "I'm having difficulty in solving the following problem:\r
\n" ); document.write( "\n" ); document.write( "Decide whether each equation has a circle as its graph. If it does, give the center and radius.\r
\n" ); document.write( "\n" ); document.write( "x2 + 6x + y2 + 8y + 9 = 0\r
\n" ); document.write( "\n" ); document.write( "Your help is GREATLY appreciated! Thank you! \n" ); document.write( "

Algebra.Com's Answer #489914 by Alan3354(69443) $\"\"$ $\"About$

You can put this solution on YOUR website!
Decide whether each equation has a circle as its graph. If it does, give the center and radius.\r
\n" ); document.write( "\n" ); document.write( "x2 + 6x + y2 + 8y + 9 = 0
\n" ); document.write( "----------------
\n" ); document.write( "It's a circle.
\n" ); document.write( "x^2 + 6x + y^2 + 8y + 9 = 0
\n" ); document.write( "x^2 + 6x + y^2 + 8y = -9
\n" ); document.write( "Complete the square for x and y.
\n" ); document.write( "x^2 + 6x + 9 + y^2 + 8y + 16 = -9 + 9 + 16 = 16
\n" ); document.write( " $\"%28x%2B3%29%5E2+%2B+%28y%2B4%29%5E2+=+16\"$
\n" ); document.write( "Center (-3,-4)
\n" ); document.write( "r = 4
\n" ); document.write( " \n" ); document.write( "

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