document.write( "Question 727319: Change the equation below to h,k form. Find the center and the radius of the circle. Then, Graph the circle.\r
\n" ); document.write( "\n" ); document.write( "X^2+y^2-10x+2y+22=0
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Algebra.Com's Answer #445064 by MathLover1(20850)\"\" \"About 
You can put this solution on YOUR website!
\"x%5E2+%2B+y%5E+2+%2B+a+x+%2B+b+y+=+c+\"...standard form\r
\n" ); document.write( "\n" ); document.write( "given:\r
\n" ); document.write( "\n" ); document.write( "\"x%5E2%2By%5E2-10x%2B2y%2B22=0\"\r
\n" ); document.write( "\n" ); document.write( "\"x%5E2%2By%5E2-10x%2B2y=-22\".........\"a=-10\", \"b=2\", \"c=-22\"\r
\n" ); document.write( "\n" ); document.write( "the center has coordinates (\"-a%2F2\" , \"-b%2F2\") and radius \"r\" such that \"r%5E2+=+c+%2B+%28a%2F2%29%5E+2+%2B+%28b%2F2%29+%5E2\"\r
\n" ); document.write( "\n" ); document.write( "so, you have
\n" ); document.write( "(\"-a%2F2\" , \"-b%2F2\")=(\"-%28-10%29%2F2\" ,\"+-2%2F2\")=(\"10%2F2\",\"-2%2F2\")=(\"5\",\"-1\")\r
\n" ); document.write( "\n" ); document.write( "the center is at (\"5\",\"-1\")\r
\n" ); document.write( "\n" ); document.write( "\"r%5E2+=+c+%2B+%28a%2F2%29%5E+2+%2B+%28b%2F2%29+%5E2\"
\n" ); document.write( "\"r%5E2+=+-22+%2B+%28-5%29%5E+2+%2B+%281%29+%5E2\"
\n" ); document.write( "\"r%5E2+=+-22+%2B25+%2B+1\"
\n" ); document.write( "\"r%5E2+=+-22+%2B26\"
\n" ); document.write( "\"r%5E2+=+4\"
\n" ); document.write( "\"r=2\"\r
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\n" ); document.write( "\n" ); document.write( "Substitute the above into the original equation and write in the standard form of the equation of a circle:\r
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\n" ); document.write( "\n" ); document.write( "\"%28x+-+h%29+%5E2+%2B+%28y+-+k%29+%5E2+=+r+%5E2+\"...\"h=5\", \"k=-1\", and \"r=2\"\r
\n" ); document.write( "\n" ); document.write( "\"%28x+-+5%29+%5E2+%2B+%28y+%2B1%29+%5E2+=+4+\"\r
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